I've put together a fixed gear bike and am having a bit of trouble with chain tension.
The chain is much tighter at one point of the crank revolution than the rest.
I tried rotating the chainring on the spider, thinking that the ring was out-of round (this is a heavily worn chainring). Unfortunately this had no discernable effect.
My next thought is that the spider arms are out of round, but i am not quite sure what the best method of checking that would be.
Anyone have any ideas for me?
PS. No, the chainring is not a BIOPACE.