Rotor 3D+ InPower Powermeter aero crankset. Compatible with the vast majority of frames on the market. Crank arm is 172.5mm 53/39, 130BCD. Axle-based power management system that provides you with more precise power measurement data protected from shock, temperature fluctuations and the outside elements. Left crank measurement only, but algorithm can calculate the other side. Compatible with any ANT+ protocol. Used, in great condition. Got questions? Ask me first here or 858-251-78-87 Everything pictured is included, nothing else is included. If you have any questions don't hesitate to ask. See detailed close-up pictures and read description for more. Send me your offer! Fast and insured shipping 3-5 business days. All money earned will go towards Ukrainian charity funds.