Arm Material: aluminum Arm Length: 170 mm, 172.5 mm, 175 mm Bottom Bracket: not included BB Type: BB Threading: Bolts: aluminum Rings: 2 Spindle: Compatible Components: Shimano 10-speed Weight: 698 g Recommended Use: cycling Manufacturer Warranty: 2 years Bolt Circle Diameter: (39/53) 130 mm, (34/50) 110 mm Chainring Sizes: 39 / 53 T, 34 / 50 T