Originally Posted by
Airburst
It's not an uncommon issue, usually the problem is that the chainring isn't centred on the crank, rather than that it's out of round. Sheldon Brown explains the usual method to fix it
here.
This is sometimes an issue for tandem synchro rings. In that case there are two rings to fiddle with.
Our recumbent tandem uses an adjustable Terracycle idler system for the synchro chain in order to make a turn and adjust tension. Do any fixed gear bikes use idlers to adjust tension? Or would that be adding a usually-unnecessary layer of complexity?
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer