Regina endless primary chain for BSA Unit single such as the C15 and B40 etc. This is a 3/8 X 7/32 duplex chain with 70 links. Direct replacement for Renold chain, but less expensive. Split, soft rivet and half links are available for this chain.

This will fit all of the following BSA models. BSA B25/SS Gold Star/B25T 250cc (1971-72), C15/SS80 250cc (1960-67), C25 Barracuda/B25 Starfire 250cc (1967-69), Fleet Star & Police model 250cc (1969-70), Starfire 250cc (1969-70), B40 350cc (1961-67), B40/SS90 350cc (1962-65). Will also fit the following Triumph models, TR25W 250cc (1969-70), TR25W 250cc (1970-71), TR25SS 250cc (1971-72), TR25T 250cc (1971-72).