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Scilly.Suffolk-
I thought that was more likely, but I've been spinning the wheel for ages and the chain always becomes slack when the valve lines up with the seat-stay.
That said, the cranks were also screwed and I'm halfway through replacing them. I just put the new ones on and when spinning them round, the chain ring seems to be slightly off centre :(
I'll just tell people I have an elliptical drive train and it's intentional
cyclotron3k
I noticed my chain is sometimes slack and sometimes pretty much taught, and the slackness seems to be linked to to position of the wheel. I.e. Rotating the wheel 360° makes the chain go from taught to slack and back again.
I don't know why I haven't noticed this earlier but I replaced the cog a few months ago so I assume that's the source of the problem.
I popped the cog off and went at it with some vernier calipers. The distance between the bottom of the trough between teeth, and the thread varies between 13.5mm and 14.1mm is that enough to cause this issue?
It's a 17T 3/32 Soma Fabrications, fwiw.
If it's not the cog, is my hub probably boned?