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@EricMitjans
I'm building a new bike (fixed) from scratch.
I just mounted the chain, and I observed that when the wheel turn, the tension on the chain will vary from very tense to normal (+/- 1cm vertical play).
Behind I have a Miche Primato hub (bought second hand, never tested), with a BLB cog that I used before with no problem. On the crankset I have a Sugino RD 2 130, 165mm (second hand, never tested), and a Stronglight 50t, new.
For the cog to be deformed would be really weird, right? And the crank seemed completely fine, not to mention that the chainring is new...
Where could the problem be? It's kinda freaking me out..