"DOUBLE SPEED" bicycle chainwheel SC-CW-107, a two-ring chainwheel and crank set for geared bicycles, sized 40-48T or 42-52T. The two chainrings sit side by side, giving the rider a choice of two gears at the front. The outer ring carries a band of round perforations, both rings are bolted to a five-arm spider, and a crank arm with a pedal eye is fitted at the centre. Crank size is made to order. The finish is BCP or black, and the BCP version shows a bright silver shine. Part numbers: SC-CW-107