With a four-arm design and 104/64mm bolt circle, the SL-K Light Double is an extremely versatile crankset. There are five standard chainring combinations, from a race-spec 42/28 to an all-mountain (or big wheel) 36/22. All the combinations include 7075 aluminium chainrings, stamped for the inner and CNC machined for the outer. They’re designed for 10 speed systems. Crank arms are hollow carbon fiber, with a forged 7075 aluminium spindle between them and alloy pedal thread reinforcement. A choice of BB30 or MegaExo variants mean that nearly every bike is covered.