Rotor INPower Crank Arms for Direct Mount Chainrings
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This item is "Final Sale" and cannot be returned or exchanged
This item is "Final Sale" and cannot be returned or exchanged
This item is "Final Sale" and cannot be returned or exchanged. Once the order is processed, labeled, or shipped, the order cannot be canceled.
Every item goes through quality control prior to shipping. If there are any imperfections or issues, you will be notified prior to the order being processed.
Items on "Final Sale" are for online only. These items are not at our physical stores for purchase.
Pickup currently unavailable at RA Cycles - Brooklyn
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Questions about this product?
Rotor INPower Crank Arms for Direct Mount Chainrings
Rotor INPower Crank Arms for Direct Mount Chainrings Info
Rotor INPower Crank Arms for Direct Mount Chainrings bring left-side power measurement into Rotor's modular crank ecosystem — giving you accurate training and racing data without committing to a complete crankset overhaul. Designed for riders who already run Rotor direct mount chainrings or want the flexibility to mix and match, these arms slot cleanly into an existing build. The INPower system measures power at the left crank arm, then doubles the reading to estimate total output — a proven, reliable approach used by amateur and professional riders alike.
The crank arms themselves are forged and machined from aluminum, reflecting Rotor's longstanding focus on stiffness-to-weight in their drivetrain components. The integrated strain gauge sits inside the left arm, keeping the measurement system protected from impacts and contamination that can compromise external sensor pods. Three crank lengths — 165mm, 172.5mm, and 175mm — cover a wide range of rider geometries, and the direct mount interface means you can run any compatible Rotor chainring configuration, from compact to wide-range setups. Connectivity is ANT+ and Bluetooth Smart, so the data reaches your head unit or training app without additional pairing steps.
Rotor INPower Crank Arms for Direct Mount Chainrings — Specs at a Glance
- Power measurement: Left-side with doubles algorithm
- Chainring compatibility: Rotor direct mount
- Available lengths: 165mm, 172.5mm, 175mm
- Connectivity: ANT+ and Bluetooth Smart dual broadcast
- Finish: Black
- Sensor location: Integrated inside left crank arm
Design Benefits
- Modular compatibility with Rotor's direct mount system — because the chainring interface is separate from the arm itself, you can run 1x or 2x setups and swap ring sizes without replacing the power meter. That flexibility makes these arms a sensible long-term investment for riders who change gearing between seasons or disciplines.
- Internally housed strain gauge — locating the sensor inside the crank arm rather than on an external pod reduces the risk of accidental damage during installation, group rides, or criterium racing where mechanical contact is a real concern. It also keeps the profile clean and adds no meaningful bulk to the drivetrain.
- Dual-protocol wireless broadcast means the INPower arms communicate with virtually any modern cycling computer or training platform simultaneously — useful for riders who pair a head unit with a heart rate or training app at the same time.
