RACE FACE AEFFECT R CRANKSENDURO-RATED STRENGTHA crankset is incredibly important for your mountain bike. It affects things like power transfer and performance. The Race Face Aeffect R Cranks brings enduro-rated strength but keeps the weight in the XC range. It's made of 7050 aluminum that optimizes stiffness without added weight. The Aeffect R features the Cinch system for plenty of spider options as well as the 24mm EXI interface spindle. Features Deep pocket net forged from 7050 aluminum for enhanced stiffness and weight savings Cinch spider interface and can run alloy and steel Cinch DM rings Solid and dependable crankset for hard-charging enduro riding SPECIFICATIONSSpeeds10, 11, 12BB Compatibility BSA 68/73mm, BB92, BB89. 5Chain Ring Cinch Crank Arm Length165, 170, 175mm BB Spindle Interface24mm Chainring Material-Bolt Center Diameter (BCD)Cinch Crank Arm Material7050 Aluminum Chainline Boost Compatible Bottom Bracket Included No Intended Use Enduro, All-Mountain, Trail Approximate Weight632g | Race Face | Aeffect R Cranks | Black | 170Mm | Aluminum