Race Face Aeffect Cinch Fatbike Crank Arm Set: 175mm for 170mm Rear Black, Bottom Bracket Not Included The Crank Arms Are Deep Pocket Net Forged From 6066 Aluminum To Optimize Stiffness Features Our Cinch Removable Spider Interface Which Offers The Ability To Convert Between Existing C Uses The Trusted 24Mm Exi Interface Spindle, The Aeffect Is A Rock Solid Crankset For Today'S Modern