i just built up a single speed/mountain *** street bike for my girlfriend. i used an old "diamondback outlook" frame that i found in a friends garage. it was a cheesy old beater but it had nice long horizontal dropouts and was just my girlfriends size so i took the plunge.
anyway, things were going really good. i got the frame powdercoated cheap, and reassembled it with good quality parts i had lying around. when we were just about done i decided we should take it out for a test ride. she rode it down the street and i noticed she was kinda swerving a little bit, from side to side, and making lots of corrections with the handlebars. she came back and told me that it felt "weird". i tried it too and she was right. for some totally unapparent reason the bike is just sorta all over the road. with each pedal stroke it swerves slightly to the left, and then to the right. if you even tried to take you hands off of the handlebars you'd eat **** instantly. it's that unstable. keep in mind this bike rode FINE before we took it apart. i know i put it back together right.
this problem is driving me crazy. maybe the frame was damaged at the powdercoater? is something out of alignment? i just put on a brand new pair of geax streetrunners 26x1.25 tires. any ideas???