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This upgraded three-piece crankset is made of a lightweight alloy crank combined with a steel chainwheel for superior strength and a smooth cadence every ride. The crank arm measures 170mm and doesn’t have any overlap of crank arm and chainring bolts. The standard bolt circle diameter (or BCD) is 130mm. It accommodates 9/16” pedals. Available in a ton of colors and sizes, you can pick the right choice for you and your bike. A smaller size will make accelerating simpler while a larger size will increase your highest speed.