Fsa k force light megaexo double chainsetthe k force light double is our lightest mtb crankset thanks to the hollow unidirectional carbon crank arms and twin ring setup having one fewer chainring and doing without the mounts for an inner ring on the spider cuts significant weight at 560g the k force light double is 60g lighter than the triple several chainring combinations are available allowing for a range of purposes and wheel sizes racers on 26 or 27 5in wheels can opt for a 4228 set