Stages Power Meter Shimano Dura Ace FC-7900 172.5 Left Crank Arm Single Sided

This power meter crank arm is in excellent working condition. The crank arm shows very little wear. Minor scratches and rub marks. This came off a 10 speed Dura Ace 7900 crankset, but may also fit 10 speed Ultegra and Dura Ace/Ultegra 11 speed first generation. Please do your homework before ordering for these other fitments. I have not tried them. This is a single sided power meter. If you have balanced leg strength, it will give you very accurate power numbers. If you have a weak left leg (like me - bad knee) the reading is likely to be low. For instance my average power reading on a recent ride was 118 watts with this power meter, and with another bike with a dual sided meter on the same route at the same speed I got 135 watts. But if you only have one bike with a power meter and are just looking for repeatability, it's accurate enough to get the job done.