I have an '86-'87 (don't know the year for sure but that's around it's year) and it's got a biased steering if you will, to the left. When I am riding it, I have to keep a constant pull to the right to keep it from going into the ditch. I have a low tire, but when I air it up it still does it. I have also looked at the rear axle, and it is a little bent. Could this be the cause or is it something else? By the way, I don't hear any noise, and this happens regardless if I brake, accelerate, or cruise. It also pulls quite strongly when I go onto a concrete bridge that is nice and smooth from a dirt road.