Crank arm length: 172.5 BCD: 130 (standard) Bottom bracket compatability: BB30 or PF 30, included with crankset (not GXP compatible) Chainrings: SRAM 39/53 included with crankset, also 10-speed compatible with SRAM or Shimano chainrings
Exogram Hollow Carbon crank arms Power measurement in the crankset spider 10K(TM) temperature compensation eliminates temperature effects on power measurement. AxCad(TM) accelerometer cadence removes the need for a magnet. The LED and visible ANT+(TM) ID streamline installation and operation. OmniCal(TM) means you can change chainrings without affecting accuracy. Power Balance(TM) CR2032 battery -- 300 hours of riding time. ANT+(TM) +/- 1.5% accuracy ELSA R adds a lightweight spider and Exogram crank arm that makes it lighter than the RIKEN R. Requires a compatible SRAM bottom bracket. Works with 10- and 11-speed chainrings from SRAM, Shimano(R) (10-speed only), Rotor (130 BCD only), Praxis, WickWerks and others.