Suntour XCC-100 170mm Triple Chainset Black 28-38-48T This chainset is fitted as original equipment on a number of manufacturer cycles, it features alloy crank arms for minimal flex and hard wearing steel chainrings. Ideal as an upgrade over standard steel chainsets or as a replacement for worn or damaged parts. Compatible with shimano front indexing, with its profiled rings providing long term durability with smooth crisp gearshifts. We recommend a tapered bottom bracket with an axle of around 112.5mm for a good chain line.