FSA SL-K Carbon Double MTB Chainset - 38t / 24t - BB30 - 170mm ArmFSA SL K Carbon Double MTB Chainset 38t 24t BB30 170mm Arm Engineered for the rigours of mountain bike riding, this double chainset gives riders exceptional power, speed and torque on the most demanding of adventures. It features a unidirectional carbon crank arm construction, which means that you'll benefit from its incredible strength without adding any unnecessary weight to your ride. Coming complete with a rock solid alloy core and CNC machined