The EC90 SL cranks use RaceFace Cinch technology, which allows direct mounting of 1x derailleurs and spiders for 2x derailleurs. It therefore offers great versatility in the possibility of converting your bike. The increasingly popular 1x converter setup has many advantages, including weight and simplicity. There's a stiff 30mm axle and rigid carbon crank arms for uncompromising power transfer from the pedal to the chain. BUILT FOR: ROAD / CX / TRI-TT SIZE: 172.5 / 175mm RING CONFIGURATIONS: 53/39, 52/36, 50/34, w/ REMOVABLE SPIDER SINGLE DIRECT MOUNT: 38T, 40T, 42T, 44T, 46T, 48T, 50T WEIGHT: 590g 172.5mm 52/36 w/o BB : 442g 172.5mm 40T w/o BB CHAINLINE: 1x 47mm / 2x 45mm Spindle Diameter: 30mm BB OPTIONS: BB86, BSA 68mm, PF30 68mm, BB30 68mm, BBright, 386Evo Material: EC90 CARBON Finish: MATTE CARBON