I am planning on building a fixed gear bicycle from scratch. As I understand it, 1/8" inch chain should be used on a bicycle without a deraileur and 3/32" chain should be used if the bicycle does have one. But as I use only vintage parts when working on a bicycle, I don't think I could find a single cotterless chainwheel. Most singlechainwheels back then were made for cottered bottom brackets. What I want to know is, if the rear cog is designed for 1/8" chain, and the chain is 1/8", does it matter if the chainwheel was made for 3/32" chain?
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