The Easton EC90 SL crank utilizes CINCH technology which allows for direct mount 1x rings as well as direct mount 2x spiders, and industry-leading versatility. Easton refines the design for larger ring applications with improved chain retention, while reducing running noise and friction.EC90 SL carbon arms feature hollow carbon construction, while the 30mm spindle and pedal inserts features high grade aluminumCINCH direct mount technology is compatible with both 1x and 2x setupsBottom bracket and chainrings sold separatelyCINCH removable spiders and direct mount rings utilize a 20-tooth ISIS BB tool for removal and installation