Here's a good one. So the chain kept trying to derail on me and I couldn't figure out why. I mean I went nuts looking. Broke out a micrometer and measured it all, and it's almost perfect, and way better than a stock bike. Still couldn't find it. 3 hours I looked, and a buddy of mine comes over and figures it out in 5 minutes. The skateboard wheel is too narrow and the chain is flopping over it. Wider wheel and problem fixed, hahaha. What a pain!