If your bike is set up as a singlespeed with a freewheel, then there is no reason to have a tight chain. My SS bikes are adjusted such that the chain has at least 1/4” slack at its tightest point, which means as much as 1” slack at the loosest point, and I’ve never had a chain fall off even on really rough roads. The only time chain slack really matters is on a fixed gear setup, and even then there should always be some noticeable slack in the chain.
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