I can't figure out what is wrong, or what has the bend. My chain is tighter at certain points in the rotation of the crank, but I can;t figure out if the front crank is bent or if it the rear hub that is bent. Also I don't think it would be because the axle isn't aligned correctly because then the chain wouldn't be loose at certain points and tight at others. I was about to order a new crank set but I thought I should ask first, any help is appreciated. Thanks.