The RaceFace Aeffect R crankset offers enduro-rated strength in a lightweight XC-style package, making it a solid and dependable crankset choice. - Its forged 7050 AL construction optimizes stiffness without added weight - The Aeffect R features the versatile CINCH system for plenty of interchangeable spider options - Can run alloy or steel CINCH direct mount chainrings - Boost-compatible 24mm EXI interface spindle - Direct mount chainline: 51mm / 57.5mm (Flipped Ring) - 2X Cinch spider chainline: 49.5mm - Boost 2X Cinch spider chainline: 52.5mm - Number of Chainrings: No Rings, No Spider Included - Chainline/Hub Compatibility: 135/142 MTB Hubs, 141/148 Boost Hubs, 150/157 DH Hubs - Crank Intended Use: Mountain - Pedal Spindle: 9/16" - Spindle Interface Type: RaceFace EXI - Chainring BCD: Direct Mount CINCH - BB Included: No - Chainring Included: No