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Thanks for the suggestion, how would I know from my timing rings what width chain they would accept?
user114457-
how would I know from my timing rings what width chain they would accept?
Measure the tooth thickness, anything ≤2.3mm will fit 3/32" chain. The potential clearance issue with 7E8/7R8 is where the chain passes the chainstay as it wraps round the back of the stoker's timing ring.
If you have ⅛" timing rings, which is unlikely but not actually a terrible idea, the corresponding chains are 1R8 and 1E8
gbj_tester
If you have the space for the rather wide pins, Wippermann 7E8 should last until the sun goes red giant and makes further durability moot. With small (34T) timing rings and a relatively short distance between centres (≤25½"), the 136 link length may mean you only need one, but if you need to make two joints the 7R8 is the same chain in a shorter package.