The new SHIMANO TIAGRA crank FC-R4000 carries the genes of SHIMANO's high-end racing bike components and offers an ideal balance between weight and efficiency, without compromising on stiffness. It has been specifically designed for road cycling and is available in two chainring options of 52-36T and 50-34T, as well as crank arm lengths of 165, 170, 172.5, and 175 mm.