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@shortclaud
I've been running an 1/8" chain with a 21tooth 1/8" rear sprocket and a 3/32" TA 52 tooth alloy ring for some years, and I replaced the chain yesterday. I reckon about 30,000 miles from that old chain. Can't complain about that really, as I think it was lightly used when Ioriginally fitted it. Never any jumping off probllem, just spend some time making sure the chain is running straight.