The shimano xt m785 stages power meter is a left crank arm plus power meter replacement and fits all shimano m780785 model tripledouble cranks riders only need to select the crank length of your existing crank arm the stages power meter fits all xt triple and double cranksetsspecifications accuracy 2 weight only adds 20gr to base crank arm battery life 200 hours coin cell cr2032 power range watts 0 2500 cadence range rpm 20 220 water resistance rating ipx7 frame compa