SRAM FORCE BB30 2.2 Crankset Arm Material: carbon fiberArm Length: 170 mm, 172.5 mm, 175 mm, 177.5 mmBottom Bracket: SRAM BB30BB Type: BB30BB Threading: Bolts: Rings: 2Spindle: Compatible Components: SRAMWeight: [with bottom bracket] 645 gRecommended Use: road cyclingManufacturer Warranty: 2 yearsBolt Circle Diameter: 130 Chainring Sizes: 50 / 34 T SRAM PowerGlide, 53 / 39 T SRAM PowerGlide