Evening all, I built up my new frame the other day as normal, everythin was sweet apart from the cranks/bb. I'm not sure what is wrong with them but there must be something wrong due to a big tight spot in my chain, I don't quite know why its there. When I spin the cranks back fast you can see my bash ring moving from side to side as if something is bent! Everythin there is tight, my freewheel, the bb and cranks are all fine but this is driving me mad because I can't get good chain tension. Please help me Thanks.