The EC90 SL crank utilizes the Race Face CINCH technology, which allows for direct mount 1x rings as well as direct mount 2x spiders, and industry-leading versatility. Increasingly popular 1x setups have many advantages including weight and simplicity. Their major limitation is adaptability. A Cyclocross rider's ability to ride a course, then effortlessly change chainrings to their preferred setup is a major necessity that has, until now, been overlooked. Easton refines the design for larger ring applications with improved chain retention while reducing running noise and friction. Arms come assembled with spindle. Rings and BB sold separately. - EC90 SL carbon arms feature hollow carbon construction, while the spindle and pedal inserts features high-grade aluminum - CINCH direct mount technology is compatible with both 1x and 2x setups - CINCH removable spiders and direct mount rings utilize a 20-tooth ISIS BB tool for removal and installation - Chainline: 1x 47mm / 2x 45mm - Hub Compatibility: 130 Hubs, 135/142 Road Disc Hubs > 415 mm Chainstay, 135/142 Road Disc Hubs < 415 mm Chainstay - 30mm spindle - BB Options: BB86, BSA 68mm, PF30 68mm, BB30 68mm, BBright, 386Evo - Bottom bracket and chainrings sold separately