Triumph / BSA Unit Singles "Duplex" Primary Chains (1) - B25 / C25 / B44 / B50 / Etc - Choose Brand / Application

Is your primary unit single primary chain stretched or worn? Replace it today with our high quality primary chains we have to offer. Choose from Renold & KCM brand chains... 

We stock primary chains to fit all Triumph and BSA unit singles (excluding the Cub) from 1959-1973 from the C15, B40, C25, TR25W, B25, etc. We also stock a primary chain for TR5MX, B44 & B50 models from 1966-1973.

Please keep in mind that 250 & 350 models use a 70L chain while 441 & 500 models use a 72L chain. Please refer to your parts catalog for proper fitment.