This stages power product pairs adds power to fsa energy bb386evo cranksets and fsa sl k light 2014 version carbon drive side cranks 386evo specific bottom brackets and adapters solid separately for more information about the fsa bb386evo benefits see the fsa websitespecifications 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 compatibility m