If you are running Rotor cranks, this is the non drive side crank arm to give you power read outs. This power meter is in great shape. Used for about a year on my mountain bike that saw minimal use. Bike is sold, now pm is for sale. Uses 1 AA battery, very easy to change. No tools. Easy setup. Rex cranks are amazing. I liked them much more than XX1.

175mm

$300 obo


http://rotorbike.com/catalog/default...r-rex-1-1.html

https://www.youtube.com/watch?v=2Mgp5p9EYxQ