Fsa sl k carbon mexo d 10 cranksetwith a four arm design and 10464mm bolt circle the sl k carbon is an extremely versatile crankset it features 7075 aluminium chainrings stamped for the inner and cnc machined for the outer theyre designed for 10 speed systems crank arms are hollow carbon fibre with a forged 7075 aluminium spindle between them and alloy pedal thread reinforcement the bottom bracket is a mega exo variety features hollow carbon fibre arms with ud weave d10 compatible sh