Race Face Aeffect Cinch Fatbike Crank Arm Set: 175mm for 190mm Rear Black, Bottom Bracket Not Included CINCH removable spiders and direct mount rings utilize a 20-tooth ISIS cup BB tool for removal and installation 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 Crank arms forged from 6066 aluminum 2X Cinch spider chainline: 76-78mm