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  • Rotor - 2INpower Powermeter Crank Arms - Black

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  • Rotor - 2INpower Powermeter Crank Arms - Black

Rotor 2INpower Powermeter Crank Arms


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    • Black,175mm/110 BCD

    2 Reviews


    Get fed.

    Few areas of the cycling industry seem as unnecessarily cluttered with options as powermeters, but Rotor's 2INpower Powermeter Crankset, unveiled in 2016, has already earned its place at the table. Under Dimension Data's Cummings, the 2INpower was ridden to stage wins at Tirreno, the Dauphiné, and the British, Basque, and French tours. That's an impressively developed pedigree for such a young product. Though Cummings' engine is largely responsible for that success, it's easy to assume that his penchant for knowing exactly when to make his move—and his ability to make 60km solo attacks stick—is informed by the accuracy and reliability of the info he's being fed by the 2INpower.

    We'll get to that info in a moment, but for now, the internals: Instead of housing them in the spider or in attachments to the crank arms or chainrings, Rotor situates all of the electronics in the spindle. This provides more protection against the elements (be they rain, snow, or tarmac encountered during the inevitable user error), and it also helps to tidy up the crank's silhouette by eliminating bulbous protrusions at the crank arm/chainring interface—of course, Rotor's typically aggressive, Euro-race graphical treatment and iconoclastic chainring designs still manage to stand out.

    While the electronics are all spindle-bound, the power measurement circuit encompasses both the spindle and the right crank arm, with both receiving four strain gauges for a total of eight. This seems excessive in an industry where five strain gauges is the high end of normal, but incorporating more gauges reduces the chance that external conditions (read: rapid changes in temperature) can adversely affect the 2INpower's accuracy. Since they're laid out in opposition, the eight gauges work as internal correctives to each other to provide more points of input, help the system reduce drift, and eliminate the need to constantly zero by establishing a more comprehensive body of aggregate data.

    As with other power meter cranksets, the 2INpower is equipped with an accelerometer to read cadence; unlike other meters, Rotor's design measures cadence over 500 times per pedal stroke. While the benefits of mapping minute changes in cadence over each leg's power production are immediately obvious to any data obsessive, the potential is magnified exponentially when paired with Rotor's Q-Ring system. It helps you chart the most efficient Q-Ring orientation possible to capitalize on the strengths of your pedal stroke while mitigating the weaknesses. The crank arms work just fine with traditional round rings, but adding Rotor's Q-Rings takes full advantage of the system's potential.

    The 2INpower transmits data via ANT+ and Bluetooth Smart protocols, so chances are good that it's already compatible with whatever head unit you're running. It's also compatible with virtually all bottom bracket standards with the notable exception of BB90. The battery is fully contained and rechargeable via a magnetic connection in the proximal end of the crank arm. While it's recharging, Rotor provides a seamless data upload and management interface by partnering with TrainingPeaks.

    • Expand your metrics game with obsessively detailed data
    • Eight strain gauges increase accuracy and reduce need to zero
    • Measures left and right legs independently
    • Charts cadence information 500 times per pedal stroke
    • Electronics housed in spindle for protection from elements
    • Rechargeable battery with magnetic attachment port
    • Alloy construction proven in the world's biggest races
    • Charts maximum pedaling efficiency when paired with Q-Rings
    • Item #RTR000Z

    Tech Specs

    Arm Material
    7055 aluminum alloy
    Arm Length
    170 mm, 172.5 mm, 175 mm
    Bolt Circle Diameter
    110 mm
    Compatible Components
    round and oval chainrings, 9, 10, and 11-speed drivetrains
    Recommended Use
    Manufacturer Warranty
    2 years

    Tech Specs

    • Reviews
    • Q & A

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    Great Power Meter

      The 2inpower is one of the best options out there. Super reliable and easy to use. Quick accurate and consistent. With the Strain Gauges pulling data from the spindle and crank arms, it measures a true right and left balance. You want be disappointed. It is even rechargeable, so forget having to buy a battery out on your ride when you power meter dies. Just simply plug it in!


      • Familiarity: I've put it through the wringer

      I bought these cranks less than a year ago. I needed the dual power meter because I was correcting a muscle imbalance and part of my therapy required me to measure my L & R power output. I thought I was making progress on my recovery when I started to regress again, my imbalance was back. Then after a month the imbalance was so off it was obvious it wasn't me but rather the power meter was failing and eventually stopped working all together on one side. I was very annoyed because of the wasted time I'd spent attempting to correct a problem that wasn't me. What makes this whole thing worse is that I'm having a hard time getting Rotor to respond to my warranty claim. They responded quickly at first, then for no reason closed my ticket and are now not responding. I'm going to try Rotor again but frankly this is has been a pretty bad experience.

      Ok. I feel it only fair to provide an update. Turns out the poor communication with Rotor was due some lost emails(my fault I think). I had to do a bit more troubleshooting but in the end Rotor were very good and expedient with replacing the faulty set. Thank you.