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G3 Power Meter Hub - Shimano

Get it by 12/25!

A lightweight instrument to improve performance, the PowerTap G3 Power Meter hub for Shimano components measures how hard you pedal and transmits the data to an ANT+ compatible device for analysis.

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REI
$789.00 See It
GS 20 Hole Straight Pull Front Hub w/ DT Swiss Internals Black, Front

If you're going to train on a PowerTap rear hub, you should be sure that your front wheel matches. After all, your bike deserves a little love. The GS 20 Hole Straight Pull Front Hub w/DT Swiss Internals, is a perfect match to your GS PowerTap rear hub. PowerTap partnered with DT Swiss to create its GS line. The "S" in the title stands for "straight-pull" and as expected, all of the hubs feature straight-pull spokes. PowerTap effectively wanted to increase some of the performance and durability metrics of its brand and did so with a redesigned body. The GS series is not taking the place of the G3 series, and should not be confused. It is merely another option in hub design being offered by PowerTap. The front hub features a DT Swiss 240 straight-pull hub shell with 20 spoke holes and DT Swiss bearings. The GS 20 Hole Straight Pull Front Hub w/ DT Swiss Internals is available in Black.

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Competitive Cyclist
$219.99 See It
GS 24 Hole Straight Pull Hub w/ DT Swiss Internals

PowerTap has been designing power hubs for over 15 years -- adapting to changing technology, going from bulky wired units to streamlined wireless models, it keeps ahead of the curve in terms of power metrics. And compared to many crank-based systems PowerTap hubs are not only less expensive, they are also more easily swapped between various bikes. The GS 24-hole hub with DT Swiss internals is its latest creation. The "S" in the title stands for "straight-pull" and as you would expect, the spokes on the hub are indeed straight-pull. To that end, PowerTap worked with DT Swiss to completely redesign the hub body. Although the electronics are identical to the G3 hub, and the caps are interchangeable, the body itself looks completely different. The idea behind the hub was to up the ante in durability and performance. The GS series is not a replacement for the G3, nor is it the next iteration; which is why it's not called the G4. The bodies are DT Swiss' 240 straight-pull shells and come with DT Swiss bearings for an even smoother riding wheel. Like the G3, the electronics are built into the end cap. This means that if you have wheel-based power reading problems, you're able to send just the end back rather than your whole wheel. Additionally, it is powered by a single CR2032 watch battery, which is easier to source than the two 357 batteries in older hubs. It lasts for about 300 hours of riding. The GS features an ANT+ transmitter so that any compatible head unit is able to read the metrics. The "torque tube" design of the hub features eight strain gauges that yield power measurements within +/- 1. 5% accuracy. The GS 24 Hole Straight Pull Hub w/ DT Swiss Internals comes in Black. It is available with either a Shimano/SRAM or Campagnolo freehub. Please note that it does not include a skewer.

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Competitive Cyclist
$1,089.99 See It
GS 24 Hole Straight Pull Hub w/ DT Swiss Internals Black, Shimano

PowerTap has been designing power hubs for over 15 years -- adapting to changing technology, going from bulky wired units to streamlined wireless models, it keeps ahead of the curve in terms of power metrics. And compared to many crank-based systems PowerTap hubs are not only less expensive, they are also more easily swapped between various bikes. The GS 24-hole hub with DT Swiss internals is its latest creation. The "S" in the title stands for "straight-pull" and as you would expect, the spokes on the hub are indeed straight-pull. To that end, PowerTap worked with DT Swiss to completely redesign the hub body. Although the electronics are identical to the G3 hub, and the caps are interchangeable, the body itself looks completely different. The idea behind the hub was to up the ante in durability and performance. The GS series is not a replacement for the G3, nor is it the next iteration; which is why it's not called the G4. The bodies are DT Swiss' 240 straight-pull shells and come with DT Swiss bearings for an even smoother riding wheel. Like the G3, the electronics are built into the end cap. This means that if you have wheel-based power reading problems, you're able to send just the end back rather than your whole wheel. Additionally, it is powered by a single CR2032 watch battery, which is easier to source than the two 357 batteries in older hubs. It lasts for about 300 hours of riding. The GS features an ANT+ transmitter so that any compatible head unit is able to read the metrics. The "torque tube" design of the hub features eight strain gauges that yield power measurements within +/- 1. 5% accuracy. The GS 24 Hole Straight Pull Hub w/ DT Swiss Internals comes in Black. It is available with either a Shimano/SRAM or Campagnolo freehub. Please note that it does not include a skewer.

more >>
Competitive Cyclist
$1,089.99 See It
GS 20 Hole Straight Pull Front Hub w/ DT Swiss Internals

If you're going to train on a PowerTap rear hub, you should be sure that your front wheel matches. After all, your bike deserves a little love. The GS 20 Hole Straight Pull Front Hub w/DT Swiss Internals, is a perfect match to your GS PowerTap rear hub. PowerTap partnered with DT Swiss to create its GS line. The "S" in the title stands for "straight-pull" and as expected, all of the hubs feature straight-pull spokes. PowerTap effectively wanted to increase some of the performance and durability metrics of its brand and did so with a redesigned body. The GS series is not taking the place of the G3 series, and should not be confused. It is merely another option in hub design being offered by PowerTap. The front hub features a DT Swiss 240 straight-pull hub shell with 20 spoke holes and DT Swiss bearings. The GS 20 Hole Straight Pull Front Hub w/ DT Swiss Internals is available in Black.

more >>
Competitive Cyclist
$219.99 See It
G3 Hub Black, 24 Hole, Shimano

The PowerTap G3 Wireless Hub is definitively PowerTap's top offering. Where the earlier generation stood out for its larger-than-normal diameter, this one has a powermeter disguised inside a traditional-looking 57mm flange diameter and subtle matte Black finish. It's also significantly lighter. In other words, it looks and feels like a regular hub. For reference, Chris King hubs have a flange diameter of 53mm, so the G3 is just a teeny bit larger. And for reference, hubs of Ultegra-quality are around 350g, so the 325g G3 Hub is lighter than all but than the very top-tier rear hubs on the market. Admittedly, there was a sort-of dorky virtue in having a bulky carbon hub that shouted "powermeter," and the individualized aesthetic of PowerTap's older hubs functioned as advertising. However, PowerTap's power-measuring hubs were so obvious it often acted as an impediment for many potential users. The sleek and stealthy design of the G3 eliminates this distraction. Knowing the value in weight reduction and stealth measuring, PowerTap looked at how to improve its powermeter without any compromise in performance. The G3 design still has a "torque tube" with eight strain gauges, yielding measurements accurate within +/- 1. 5%. But PowerTap didn't stop there. Rather than keep the electronics permanently affixed to the hub shell, PowerTap decided to build the electronics into the end cap. This is a big change, and a welcome one. By having a removable electronic element, it means that if there's a wheel-based problem with power readings, you're able to get a spare cap and install it, rather than sending your wheel back to PowerTap and waiting for the issue to be resolved. Another improvement that comes with this change is that a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The 2032 should last for approximately 300 hours of riding. The G3 is equipped with an ANT+ tr...

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Competitive Cyclist
$710.99 See It
G3 Hub Black, 28 Hole, Campagnolo

The PowerTap G3 Wireless Hub is definitively PowerTap's top offering. Where the earlier generation stood out for its larger-than-normal diameter, this one has a powermeter disguised inside a traditional-looking 57mm flange diameter and subtle matte Black finish. It's also significantly lighter. In other words, it looks and feels like a regular hub. For reference, Chris King hubs have a flange diameter of 53mm, so the G3 is just a teeny bit larger. And for reference, hubs of Ultegra-quality are around 350g, so the 325g G3 Hub is lighter than all but than the very top-tier rear hubs on the market. Admittedly, there was a sort-of dorky virtue in having a bulky carbon hub that shouted "powermeter," and the individualized aesthetic of PowerTap's older hubs functioned as advertising. However, PowerTap's power-measuring hubs were so obvious it often acted as an impediment for many potential users. The sleek and stealthy design of the G3 eliminates this distraction. Knowing the value in weight reduction and stealth measuring, PowerTap looked at how to improve its powermeter without any compromise in performance. The G3 design still has a "torque tube" with eight strain gauges, yielding measurements accurate within +/- 1. 5%. But PowerTap didn't stop there. Rather than keep the electronics permanently affixed to the hub shell, PowerTap decided to build the electronics into the end cap. This is a big change, and a welcome one. By having a removable electronic element, it means that if there's a wheel-based problem with power readings, you're able to get a spare cap and install it, rather than sending your wheel back to PowerTap and waiting for the issue to be resolved. Another improvement that comes with this change is that a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The 2032 should last for approximately 300 hours of riding. The G3 is equipped with an ANT+ tr...

more >>
Competitive Cyclist
$789.99 See It
G3 Hub Black, 24 Hole, Campagnolo

The PowerTap G3 Wireless Hub is definitively PowerTap's top offering. Where the earlier generation stood out for its larger-than-normal diameter, this one has a powermeter disguised inside a traditional-looking 57mm flange diameter and subtle matte Black finish. It's also significantly lighter. In other words, it looks and feels like a regular hub. For reference, Chris King hubs have a flange diameter of 53mm, so the G3 is just a teeny bit larger. And for reference, hubs of Ultegra-quality are around 350g, so the 325g G3 Hub is lighter than all but than the very top-tier rear hubs on the market. Admittedly, there was a sort-of dorky virtue in having a bulky carbon hub that shouted "powermeter," and the individualized aesthetic of PowerTap's older hubs functioned as advertising. However, PowerTap's power-measuring hubs were so obvious it often acted as an impediment for many potential users. The sleek and stealthy design of the G3 eliminates this distraction. Knowing the value in weight reduction and stealth measuring, PowerTap looked at how to improve its powermeter without any compromise in performance. The G3 design still has a "torque tube" with eight strain gauges, yielding measurements accurate within +/- 1. 5%. But PowerTap didn't stop there. Rather than keep the electronics permanently affixed to the hub shell, PowerTap decided to build the electronics into the end cap. This is a big change, and a welcome one. By having a removable electronic element, it means that if there's a wheel-based problem with power readings, you're able to get a spare cap and install it, rather than sending your wheel back to PowerTap and waiting for the issue to be resolved. Another improvement that comes with this change is that a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The 2032 should last for approximately 300 hours of riding. The G3 is equipped with an ANT+ tr...

more >>
Competitive Cyclist
$789.99 See It
G3 Hub Black, 20 Hole, Shimano

The PowerTap G3 Wireless Hub is definitively PowerTap's top offering. Where the earlier generation stood out for its larger-than-normal diameter, this one has a powermeter disguised inside a traditional-looking 57mm flange diameter and subtle matte Black finish. It's also significantly lighter. In other words, it looks and feels like a regular hub. For reference, Chris King hubs have a flange diameter of 53mm, so the G3 is just a teeny bit larger. And for reference, hubs of Ultegra-quality are around 350g, so the 325g G3 Hub is lighter than all but than the very top-tier rear hubs on the market. Admittedly, there was a sort-of dorky virtue in having a bulky carbon hub that shouted "powermeter," and the individualized aesthetic of PowerTap's older hubs functioned as advertising. However, PowerTap's power-measuring hubs were so obvious it often acted as an impediment for many potential users. The sleek and stealthy design of the G3 eliminates this distraction. Knowing the value in weight reduction and stealth measuring, PowerTap looked at how to improve its powermeter without any compromise in performance. The G3 design still has a "torque tube" with eight strain gauges, yielding measurements accurate within +/- 1. 5%. But PowerTap didn't stop there. Rather than keep the electronics permanently affixed to the hub shell, PowerTap decided to build the electronics into the end cap. This is a big change, and a welcome one. By having a removable electronic element, it means that if there's a wheel-based problem with power readings, you're able to get a spare cap and install it, rather than sending your wheel back to PowerTap and waiting for the issue to be resolved. Another improvement that comes with this change is that a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The 2032 should last for approximately 300 hours of riding. The G3 is equipped with an ANT+ tr...

more >>
Competitive Cyclist
$789.99 See It
G3C Hub Black, 24 Hole, Campagnolo

Ceramic Speed bearings are said to be the lightest, smoothest, and most durable bearings on the market. When you read about pro teams replacing stock bearings with ceramics, Ceramic Speed is the company they rely on. These bearings are hybrid ceramic, with steel races and rounder-than-round ceramic balls. They're the ne plus ultra of the bearing world and are the upgrade that transforms the PowerTap G3 Wireless Hub into the G3C Wireless Hub. They run smoother, and they shave 10g off of the total weight of the G3 rear hub. G3 is short for Generation Three. Much like the G2 hub, this one chops a prodigious amount of weight off the previous version, but it does much more than that. The G3 design looks like a conventional hub, with a Matte Black finish and smaller diameter that masks the hub's purpose. This is only the most obvious of the changes. A much bigger deal is the new electronics configuration. They're now attached to the left hub cap rather than to the hub body, and they're able to be serviced without sending back the hub or rendering it useless. That the brains of the hub are able to be serviced without sending back the wheel is huge. Just about every single powermeter ever produced, whether it's a hub, crank, or a pedal, it needs to be serviced at some time over its operating life. Until now, you've needed to give up your precious meter for days, or even weeks, to get it worked on and returned. We've witnessed power fiends get despondent and desperate, trying to figure out how they can source a spare powermeter for the duration of the absence. Now, you're able to get a spare cap with all of the electronics before you send yours in. And shipping is simpler and cheaper when you don't have to stick a wheel in a box. Another improvement that comes with this change is a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The battery should last for approxima...

more >>
Competitive Cyclist
$1,289.99 See It
G3C Hub Black, 20 Hole, Shimano

Ceramic Speed bearings are said to be the lightest, smoothest, and most durable bearings on the market. When you read about pro teams replacing stock bearings with ceramics, Ceramic Speed is the company they rely on. These bearings are hybrid ceramic, with steel races and rounder-than-round ceramic balls. They're the ne plus ultra of the bearing world and are the upgrade that transforms the PowerTap G3 Wireless Hub into the G3C Wireless Hub. They run smoother, and they shave 10g off of the total weight of the G3 rear hub. G3 is short for Generation Three. Much like the G2 hub, this one chops a prodigious amount of weight off the previous version, but it does much more than that. The G3 design looks like a conventional hub, with a Matte Black finish and smaller diameter that masks the hub's purpose. This is only the most obvious of the changes. A much bigger deal is the new electronics configuration. They're now attached to the left hub cap rather than to the hub body, and they're able to be serviced without sending back the hub or rendering it useless. That the brains of the hub are able to be serviced without sending back the wheel is huge. Just about every single powermeter ever produced, whether it's a hub, crank, or a pedal, it needs to be serviced at some time over its operating life. Until now, you've needed to give up your precious meter for days, or even weeks, to get it worked on and returned. We've witnessed power fiends get despondent and desperate, trying to figure out how they can source a spare powermeter for the duration of the absence. Now, you're able to get a spare cap with all of the electronics before you send yours in. And shipping is simpler and cheaper when you don't have to stick a wheel in a box. Another improvement that comes with this change is a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The battery should last for approxima...

more >>
Competitive Cyclist
$1,289.99 See It
G3C Hub Black, 28 Hole, Shimano

Ceramic Speed bearings are said to be the lightest, smoothest, and most durable bearings on the market. When you read about pro teams replacing stock bearings with ceramics, Ceramic Speed is the company they rely on. These bearings are hybrid ceramic, with steel races and rounder-than-round ceramic balls. They're the ne plus ultra of the bearing world and are the upgrade that transforms the PowerTap G3 Wireless Hub into the G3C Wireless Hub. They run smoother, and they shave 10g off of the total weight of the G3 rear hub. G3 is short for Generation Three. Much like the G2 hub, this one chops a prodigious amount of weight off the previous version, but it does much more than that. The G3 design looks like a conventional hub, with a Matte Black finish and smaller diameter that masks the hub's purpose. This is only the most obvious of the changes. A much bigger deal is the new electronics configuration. They're now attached to the left hub cap rather than to the hub body, and they're able to be serviced without sending back the hub or rendering it useless. That the brains of the hub are able to be serviced without sending back the wheel is huge. Just about every single powermeter ever produced, whether it's a hub, crank, or a pedal, it needs to be serviced at some time over its operating life. Until now, you've needed to give up your precious meter for days, or even weeks, to get it worked on and returned. We've witnessed power fiends get despondent and desperate, trying to figure out how they can source a spare powermeter for the duration of the absence. Now, you're able to get a spare cap with all of the electronics before you send yours in. And shipping is simpler and cheaper when you don't have to stick a wheel in a box. Another improvement that comes with this change is a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The battery should last for approxima...

more >>
Competitive Cyclist
$1,289.99 See It
G3C Hub Black, 32 Hole, Campagnolo

Ceramic Speed bearings are said to be the lightest, smoothest, and most durable bearings on the market. When you read about pro teams replacing stock bearings with ceramics, Ceramic Speed is the company they rely on. These bearings are hybrid ceramic, with steel races and rounder-than-round ceramic balls. They're the ne plus ultra of the bearing world and are the upgrade that transforms the PowerTap G3 Wireless Hub into the G3C Wireless Hub. They run smoother, and they shave 10g off of the total weight of the G3 rear hub. G3 is short for Generation Three. Much like the G2 hub, this one chops a prodigious amount of weight off the previous version, but it does much more than that. The G3 design looks like a conventional hub, with a Matte Black finish and smaller diameter that masks the hub's purpose. This is only the most obvious of the changes. A much bigger deal is the new electronics configuration. They're now attached to the left hub cap rather than to the hub body, and they're able to be serviced without sending back the hub or rendering it useless. That the brains of the hub are able to be serviced without sending back the wheel is huge. Just about every single powermeter ever produced, whether it's a hub, crank, or a pedal, it needs to be serviced at some time over its operating life. Until now, you've needed to give up your precious meter for days, or even weeks, to get it worked on and returned. We've witnessed power fiends get despondent and desperate, trying to figure out how they can source a spare powermeter for the duration of the absence. Now, you're able to get a spare cap with all of the electronics before you send yours in. And shipping is simpler and cheaper when you don't have to stick a wheel in a box. Another improvement that comes with this change is a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The battery should last for approxima...

more >>
Competitive Cyclist
$1,289.99 See It
G3C Hub Black, 32 Hole, Shimano

Ceramic Speed bearings are said to be the lightest, smoothest, and most durable bearings on the market. When you read about pro teams replacing stock bearings with ceramics, Ceramic Speed is the company they rely on. These bearings are hybrid ceramic, with steel races and rounder-than-round ceramic balls. They're the ne plus ultra of the bearing world and are the upgrade that transforms the PowerTap G3 Wireless Hub into the G3C Wireless Hub. They run smoother, and they shave 10g off of the total weight of the G3 rear hub. G3 is short for Generation Three. Much like the G2 hub, this one chops a prodigious amount of weight off the previous version, but it does much more than that. The G3 design looks like a conventional hub, with a Matte Black finish and smaller diameter that masks the hub's purpose. This is only the most obvious of the changes. A much bigger deal is the new electronics configuration. They're now attached to the left hub cap rather than to the hub body, and they're able to be serviced without sending back the hub or rendering it useless. That the brains of the hub are able to be serviced without sending back the wheel is huge. Just about every single powermeter ever produced, whether it's a hub, crank, or a pedal, it needs to be serviced at some time over its operating life. Until now, you've needed to give up your precious meter for days, or even weeks, to get it worked on and returned. We've witnessed power fiends get despondent and desperate, trying to figure out how they can source a spare powermeter for the duration of the absence. Now, you're able to get a spare cap with all of the electronics before you send yours in. And shipping is simpler and cheaper when you don't have to stick a wheel in a box. Another improvement that comes with this change is a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The battery should last for approxima...

more >>
Competitive Cyclist
$1,289.99 See It
G3C Hub

Ceramic Speed bearings are said to be the lightest, smoothest, and most durable bearings on the market. When you read about pro teams replacing stock bearings with ceramics, Ceramic Speed is the company they rely on. These bearings are hybrid ceramic, with steel races and rounder-than-round ceramic balls. They're the ne plus ultra of the bearing world and are the upgrade that transforms the PowerTap G3 Wireless Hub into the G3C Wireless Hub. They run smoother, and they shave 10g off of the total weight of the G3 rear hub. G3 is short for Generation Three. Much like the G2 hub, this one chops a prodigious amount of weight off the previous version, but it does much more than that. The G3 design looks like a conventional hub, with a Matte Black finish and smaller diameter that masks the hub's purpose. This is only the most obvious of the changes. A much bigger deal is the new electronics configuration. They're now attached to the left hub cap rather than to the hub body, and they're able to be serviced without sending back the hub or rendering it useless. That the brains of the hub are able to be serviced without sending back the wheel is huge. Just about every single powermeter ever produced, whether it's a hub, crank, or a pedal, it needs to be serviced at some time over its operating life. Until now, you've needed to give up your precious meter for days, or even weeks, to get it worked on and returned. We've witnessed power fiends get despondent and desperate, trying to figure out how they can source a spare powermeter for the duration of the absence. Now, you're able to get a spare cap with all of the electronics before you send yours in. And shipping is simpler and cheaper when you don't have to stick a wheel in a box. Another improvement that comes with this change is a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The battery should last for approxima...

more >>
Competitive Cyclist
$1,289.99 See It
15mm Alloy Freehub Body Kit One Color, Shimano Ceramic 11SP

You use your PowerTap hub every single day. And no matter how clean you keep your bike and drivetrain, chances are that, sooner or later, the grooves on your freehub start to show signs of wear. Rather than having to replace the entire hub, or send it back for service, the easily-installed PowerTap 15mm Alloy Freehub Body Kit will get you up and riding in no time. The PowerTap 15mm Alloy Freehub Body Kit is available with either a Shimano 10- or 11-speed or Campagnolo 11-speed compatibility. It's also being offered with a Ceramic 11-speed Shimano option.

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Competitive Cyclist
$299.99 See It
G3 MTB Disc Hub

You train with power on the road all winter, but once the trail conditions take a turn towards race season, you're left relying upon perceived exertion and heart rate zones for your training and racing. With PowerTap's G3 MTB Disc Hub, you'll finally be able to utilize power analysis off of the road. Whereas the road versions of the G3 hub are lauded for their relatively small (57mm) diameter, PowerTap knew that an off-road version, required more strength and durability to withstand the hits and torque of trail riding. Accordingly, you'll find that this G3 iteration draws on more of the traditional G2 PRO design. However, as stated, this is because the G3 MTB hub is specifically designed for mountain bikes with disc brakes. Along these lines, the hub features a 74mm diameter and a 15mm alloy axle. And, as a result, the hub achieves an incredible stiffness-to-weight ratio. The total weight of the hub is around 680 grams, which is about 350 grams heavier than the current road G3. But, taking into account that the listed weight also includes the 160mm rotor, 680grams is pretty negligible. The G3 design features PowerTap's "torque tube" design, which relies on eight strain gauges. The eight strain gauges for the powermeter are a system of sensors that detect any resistance and then vary their output when experiencing applied force. The next step is for the strain gauges to convert this data into electrical resistance, making it capable of being measured. The refinements to the system provide stellar results. In fact, it yields measurements within +/-1. 5%. And as with the most recent iterations of the G3, PowerTap built the electronics into the end cap. So, by having the "brains" of the operation at the end cap, you're now able to easily remove the electronics for service without swapping out the entire wheel. Another improvement that comes with this change is that a single CR2032 watch battery powers the transmitter. These batteries are simple to source, and last...

more >>
Competitive Cyclist
$789.99 See It
G3 Hub Black, 32 Hole, Campagnolo

The PowerTap G3 Wireless Hub is definitively PowerTap's top offering. Where the earlier generation stood out for its larger-than-normal diameter, this one has a powermeter disguised inside a traditional-looking 57mm flange diameter and subtle matte Black finish. It's also significantly lighter. In other words, it looks and feels like a regular hub. For reference, Chris King hubs have a flange diameter of 53mm, so the G3 is just a teeny bit larger. And for reference, hubs of Ultegra-quality are around 350g, so the 325g G3 Hub is lighter than all but than the very top-tier rear hubs on the market. Admittedly, there was a sort-of dorky virtue in having a bulky carbon hub that shouted "powermeter," and the individualized aesthetic of PowerTap's older hubs functioned as advertising. However, PowerTap's power-measuring hubs were so obvious it often acted as an impediment for many potential users. The sleek and stealthy design of the G3 eliminates this distraction. Knowing the value in weight reduction and stealth measuring, PowerTap looked at how to improve its powermeter without any compromise in performance. The G3 design still has a "torque tube" with eight strain gauges, yielding measurements accurate within +/- 1. 5%. But PowerTap didn't stop there. Rather than keep the electronics permanently affixed to the hub shell, PowerTap decided to build the electronics into the end cap. This is a big change, and a welcome one. By having a removable electronic element, it means that if there's a wheel-based problem with power readings, you're able to get a spare cap and install it, rather than sending your wheel back to PowerTap and waiting for the issue to be resolved. Another improvement that comes with this change is that a single CR2032 watch battery powers the transmitter. These batteries are easier to source and replace than the two 357 batteries found in the older hubs. The 2032 should last for approximately 300 hours of riding. The G3 is equipped with an ANT+ tr...

more >>
Competitive Cyclist
$789.99 See It
G3 MTB Disc Hub Black, 32 Hole

You train with power on the road all winter, but once the trail conditions take a turn towards race season, you're left relying upon perceived exertion and heart rate zones for your training and racing. With PowerTap's G3 MTB Disc Hub, you'll finally be able to utilize power analysis off of the road. Whereas the road versions of the G3 hub are lauded for their relatively small (57mm) diameter, PowerTap knew that an off-road version, required more strength and durability to withstand the hits and torque of trail riding. Accordingly, you'll find that this G3 iteration draws on more of the traditional G2 PRO design. However, as stated, this is because the G3 MTB hub is specifically designed for mountain bikes with disc brakes. Along these lines, the hub features a 74mm diameter and a 15mm alloy axle. And, as a result, the hub achieves an incredible stiffness-to-weight ratio. The total weight of the hub is around 680 grams, which is about 350 grams heavier than the current road G3. But, taking into account that the listed weight also includes the 160mm rotor, 680grams is pretty negligible. The G3 design features PowerTap's "torque tube" design, which relies on eight strain gauges. The eight strain gauges for the powermeter are a system of sensors that detect any resistance and then vary their output when experiencing applied force. The next step is for the strain gauges to convert this data into electrical resistance, making it capable of being measured. The refinements to the system provide stellar results. In fact, it yields measurements within +/-1. 5%. And as with the most recent iterations of the G3, PowerTap built the electronics into the end cap. So, by having the "brains" of the operation at the end cap, you're now able to easily remove the electronics for service without swapping out the entire wheel. Another improvement that comes with this change is that a single CR2032 watch battery powers the transmitter. These batteries are simple to source, and last...

more >>
Competitive Cyclist
$789.99 See It
MTB Disc Brake Rotor Replacement One Color, 160mm

Training and racing with power, even in the dirt, leaves our faces glued to our computers and constantly pushing to maintain wattage outputs. However, we all have to stop some time. And if you're running a PowerTap G3 mountain bike hub, you'll need a PowerTap MTB Replacement Disc Rotor at some point. It's been built around PowerTap's proprietary eight-hole disc rotor interface, so it's not compatible with standard disc hubs. Which, in turn, also means that no other rotor is compatible with the G3 MTB. In other words, we're saying that it's wise to keep one in your spare parts collection or race-day mechanic's kit. The PowerTap MTB Disc Brake Replacement Rotor is available in a 160mm size and is only compatible with the PowerTap G3 MTB Disc Hub.

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Competitive Cyclist
$99.99 See It
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