SRAM Force 22 Crankset - 172.5mm 11-Speed 53/39t 130 BCD GXP Spindle Interface BLKSRAM Force 22 Crankset 172. 5mm 11 Speed 53 39t 130 BCD GXP Spindle Interface Black. Unidirectional carbon fiber arms and aluminum chainring spider provide excellent strength to weight. X Glide tooth profiles and shift assist pins enable quick and reliable front shifting."Hidden" chainring bolt threads into crank arm to enhance chainring stiffness Chainrings are optimized for Yaw front derailleur Q factor is 145mm TECH SPECS BB Included No Chainline