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  • PowerTap - G3 Hub  - Black

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  • PowerTap - G3 Hub  - Black

PowerTap G3 Hub


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    • Black, 32 Hole, Shimano


    2 Reviews


    Train smarter than ever.

    Shedding weight and size from previous generations, the PowerTap G3 Wireless Hub is lighter than ever, tipping the scales at a paltry 325 grams. Plus, its flange diameter has shrunk to 57 millimeters, making it feel just like a regular hub on the road. It also sports a low-key matte black finish that's much more subdued than earlier versions.

    Other than its smaller size and stealth matte black finish, the G3 Hub retains +/- 1.5% accuracy for precise power measurement. For the design of the hub, PowerTap built the electronics into the end cap itself. This allows you to swap out end caps, should you experience a reading problem, instead of sending the entire wheel to PowerTap for analysis. Moreover, it allows for easier battery replacement, as a single CR2032 battery powers the G3.

    More than a just a power meter, the G3 Hub also measures speed and cadence with high accuracy. It communicates with ANT+ cycling computers for real-time analysis of cycling statistics. Additionally, you can fit the G3 Hub with a Bluetooth Smart PowerCap (sold separately) that's compatible with popular smartphone apps, such as PowerTap mobile, Strava, and MapMyRide.

    Please note that the G3 Hub doesn't include a skewer, and it comes with a Shimano/SRAM or Campagnolo freehub body. It also includes instructions and a special tool for the hub's end cap.

    • 57mm flange diameter, 2.5mm spoke-hole diameter
    • Shimano/SRAM or Campagnolo compatible freehub
    • Works with ANT+ cycling computers
    • +/- 1.5% power meter accuracy
    • 11-speed compatible
    • Item #PAP0009

    Tech Specs

    Hub Type
    Campagnolo, Shimano
    Spoke Count
    20, 24, 28, 32
    Claimed Weight
    325 g
    Recommended Use
    training and racing with power

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Without power, you're not training

      Power is the only way to train effectively. Speed is too dependent on weather or traffic. Heart rate is too dependent on sleep, age, and health. Perceptions of exertion are often misleading. But watts don't lie. If you're able to crank out more watts, you're getting stronger. With power, you can train with incredible efficiency and see exactly where your weaknesses are and plan accordingly. In a race you'll know if you can go harder or have to back off. On a long climb, you can sit on your best number and pace yourself up while everyone else around you is going too hard and blowing up.

      Powertap is one of the least expensive power options and works very well. Spinning the wheel wakes the PT up, allowing it to be read by any ANT+ head unit. It can also estimate cadence, so you won't need a cadence sensor. Do a manual calibration before you ride and you're all set. Maybe the hub weighs more than a regular hub, but you won't notice. With many power units it's a matter of something gained/something lost. A crank unit forces you to use the same bike. The PT forces you to use the same wheel, but you can move it between different bikes. If you use different wheels, you can buy two and build them into two wheels for the price of one Quarq.

      Saris is great to work with--my end cap started transmitting intermittently and after a phone call they mailed me another one right away. It works perfectly now.

      I had mine built into a Zipp 60 rear wheel. Since the hole placement called for j-bend spokes, I went with the DT aerolite bladed spokes rather than the standard Sapim CX-ray.

      It just works

      • Familiarity: I've put it through the wringer

      And it works perfectly. Laced a 28h to archetype rims with CX-Rays makes a rock solid 972.5g wheel (with Stan rim tape) for the 162 lb rider.

      The power readings are stable, the calibration is easy and rapid with the Garmin and I just forget that the hub is not a standard hub on all rides.

      Unanswered Question

      I got a pair of 2008 ZIPP 404 Tubular (24H, 10V), Do I have just buy the HUB? or will I need to get the spokes as well? Will this hub take my old 404 to 2016?

      What are the uses for a power tap?

      What are the uses for a power tap?

      Best Answer

      Hi Anthony,

      I'm glad you asked. PowerTap hubs, and other power-measuring devices, have easily become the most popular tools to help riders become better, faster, and stronger, for both pro and non-pro riders. Most power-measuring devices, including these PowerTap hubs, allow for precise, real-time monitoring of a rider's power output, in the form of wattage. Knowing how much power you're putting out can be tremendously valuable knowledge, allowing you to track any number of variables, such as how long into a ride your power begins to fade, or whether or not your power increases at a certain cadence (pedaling frequency). Any and all information that the PowerTap provides can be downloaded to your computer, too, so you can study your performance on rides and even more accurately measure your output and the factors that affect it. You can even measure your power output at various points during your pedal stroke, so you can dial in your pedaling technique to maximize efficiency.

      Indeed, there are a wide variety of ways in which your riding can benefit from a power-measuring device. Just let me know if you'd like to place an order or if you have any other questions or concerns: my e-mail address is


      - Caffery