SRAM Riken Quarq Powermeter Road Crankset with GXP Bottom Bracket, 170mm/53/39T Carbon fiber crank arms with CNC machined aluminum spider LED indicator, Omnical, visible ANT+ ID, and CR2032 battery giving 300+ hours of riding time Accurate to +/- 1.5% SRAM TSM rings (same as SRAM Red - Black edition) gives compatibility to all SRAM 10 speed front derailleurs 823g (GXP, 130BCD, 172.5mm)