Japan cut cottered bicycle chain wheel (A) in CP, offered in 40T, 44T, 46T, 48T and 52T sizes. A chain wheel and crank turn pedalling into drive on the chain, and the cottered design fixes the crank to the bottom bracket axle with a cotter pin. The Japan cut chainring has an open pattern of concentric rings joined by short spokes, with a single crank arm, all in a bright silver finish.