I have now broken three o ring chains. I have checked the alignment of the axle. The sprockets are not wearing out on the sides or anything like that. When the first chain broke it broke a tooth off of the coutershaft sprocket. When I removed it I noticed that the chain had been rubbing a wear mark in the case. I replaced the countershaft sprocket and have since broken 2 more chains. The outside part of the link is just tearing in half. This bike makes really good power but I think somthing else is wrong. Any Ideas???