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Recently built up a fixed from an old 5 speed. When riding though the chain has a tendancy to skip off - not very safe at all!
Chain tension seems fine, chain line looks ok too. The chainring is ever so slightly warped it would seem, which i would diagnose as the problem. Can you unwarp a chainring though?
Is the chain tension fine all the way round? ie it has no tight/baggy spots?
you could try bending the ring back with an adjustable spanner, or just replace it if you don't mind spending a few quid.
I've bent big a big chainring back with an adjustable spanner before. Admitedly it wans't single speed but I didn't have any problems afterward
Should be able to straighten a chainring OK, more likely a loose spot.
Checked round the pedal rotation and there was a slight loose spot so i've walked the wheel along the dropouts at the loose spot.
Chain nearly binds but not quite and i guess with a bit of stretch it'll be ok. Hopefully that will fix it - else i'll take the wrench to the chainring, but it really isnt warped much at all.
Thanks for the advice all..