They are coped for 1" tubing

Fits 45 Solo 1930-up

and cotter pins to mount chain guard on 1929-1934 Singles and 1929-1940 all 45s

in your choice of Finned or Fish Scale

twins and triples

Renolds Duplex Primary Chain Triumph OEM #60-0477 Made in UK Makes_Yamaha They are coped for 1"These primary chains are made in England by Reynolds, as originally supplied from the Triumph factory. This duplex (dual row) chain is for Triumph motorcycles with a duplex primary such as unit construction (1963 and up) 650 c. c. Triumphs. No master link needed on these style chains, they are a continuous loop and are put in place at the same time as your engine sprocket and clutch hub as one unit. The stock Triumph part number is 60 0477.