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 aluminumCompatible 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 configurations24mm EXI spindle compatible with Race Face X-Type bottom brackets or Hollowtech II compatible bottom bracketsCINCH removable spiders and direct mount rings require a 20-tooth ISIS cup BB tool for removal and installation TECH SPECS table{border-collapse:collapse;width:100%;} td{text-align:left;padding:8px;font-weight:350;} tr:nth-child(even){background-color:#f2f2f2} th{background-color:#eb212e;color:white;text-align:left;padding:8px;} .desc .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Rings Sold Separately Number of Chainrings No Rings, No Spider Included Drivetrain Speeds 12 Chainring BCD Direct Mount CINCH Chainline/Hub Compatibility 141/148 Boost Hubs Color Black Crank Length (mm) 165 Crank Intended Use Mountain BB Included No Pedal Spindle 9/16" Spindle Interface Type Shimano Hollowtech II Defined Color Black keyword search RXC137 Crank Length 165Mm