This chainset is a lightweight alloy crank, with 170mm arms and a classic 3 bolt design. The chainring combination is either 50/34t (the modern compact standard) making this crank a great option for updating and down-gearing your existing 52/42t (or similar) vintage crank, or 46/30t for all round super compact mid/low range. They are not as good as a René Herse crankset, but for those who cant afford RH, this is an excellent affordable option.