I have a new single-speed bike (after purchase this year, it was unused in a garage for a few months), but as I turn the pedals, the tension in the chain varies noticeably.
What should I check, one-by-one, to find the source (and fix it)?
If not mitigated (I'm guessing it'll never be perfect), can it wear down the chain/sprokets faster? Cause any other issues?
More information, and bonus question:
I'm also having an issue that twice per a full pedal rotation, there is a click sound that seems to come from the bottom bracket. Not sure if related?