I have a fixed gear bicycle with a chain that gets periodically tight and loose as I complete a rotation of the pedals. How do I center my chainring so that the chain has even tension throughout?
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First off, apologies for the first comment. OP is a friend of mine and I intended to post that as a joke. For some retribution here is some real advice:
It might be one of these two things.
I want to provide an initial answer to this question with some resources that I have discovered and attempted.
There are some cases where this problem occurs when there is an incompatibility between the crank and the bottom bracket, because the ISO square taper to the JIS taper differ on their angles.
If for example you got a Sugino 75 crank with a JIS taper you will get that effect, whereas with an ISO taper it centers perfectly.