The Race Face Aeffect crank is designed to handle aggressive trail riding at XC crank weight and an attractive pricepoint. Features the CINCH system with its interchangeable spider options and a 24mm EXI interface spindle. Crank arms forged from 6066 aluminum Compatible with all CINCH direct mount rings and spiders to easily convert between existing chainring standards including: direct mount, 1x, 2x with and without bash, and 3x configurations 24mm EXI spindle compatible with Race Face X-Type bottom brackets or Hollowtech II compatible bottom brackets CINCH removable spiders and direct mount rings utilize a 20-tooth ISIS cup BB tool for removal and installation Bottom bracket and chainring not included Direct mount chainline: 2X Cinch spider chainline: 48.5-50.5mm Boost 2X Cinch spider chainline:51.5-53.5mm Race Face Aeffect Crank Arm Set 175mm Black Chainring BCD: Direct Mount CINCH Crank Intended Use: Mountain Crank Length (mm): 175 Number of Chainrings: No Rings, No Spider Included Chainline/Hub Compatibility: 135/142 MTB Hubs Rings: Sold Separately Pedal Spindle: 9/16" Drivetrain Speeds: 12 Spindle Interface Type: RaceFace EXI Drivetrain Speeds: 11 Defined Color: Black Chainline/Hub Compatibility: 157 Super Boost Hubs Color: Black Drivetrain Speeds: 9 Drivetrain Speeds: 10 Weight: 715 BB Included: No Chainline/Hub Compatibility: 141/148 Boost Hubs