So, would a bent chain ring cause...
... a chain to be taut for 1/2 a crank rotation and loose the other half? Any other possibility?
It's my buddies Surly Steamroller. I swapped out his 19t cog for a 16t and noticed while tensioning the back wheel, the chain seemed taut then all the sudden it was loose. I rotated the crank and the chain goes from taut to loose each half rotation. The back wheel is straight and true. The cog is on properly. I know a bent chain ring can cause a symptom like this but could it be anything else? I suppose I should take off the chain and eyeball the crank and chain ring to check but any other possibility?
-R