This power meter crankset takes SRAM's brilliantly stiff, hollow carbon XX1 cranks & marries them to an integrated, ultra-precise Quarq Power Meter for feathery low weight & accurate power measurement. Feel every watt course through the crank & propel you forward, while every iota of your strength is recorded with an accuracy of +/- 1.5%. Having precise objective feedback lets you see your improvements. Plus, to make setup as easy as possible, it features an easily accessible, weather-tight battery compartment. Please Note: Chainring & bottom bracket sold separately