GEN 2 STAGES POWER | ULTEGRA 6800 -170mm Go to amazon.com Related posts How to buy the best stages cycling? FeatureAccuracy: 2%Weight: Only adds 20g to base crank armBattery Life: 200+ hours (coin cell: CR2032)Power range (Watts): 0 to 2500Water resistance rating: IPX7 DescriptionStages Power meter built on Shimano's Ultegra 6800 non-driveside crankarm