What kinda collision was it, t-boned? if so, and either way I guess, when you find a new c-arm ride the bike no handed afterwords, id be kinda surprised if the bike still tracks straight. I got t-boned once, snapped the BB spindle at the left crank and bent pedal axle, replaced the necessary parts and rode, bike always pulled to the left after that. Had a pretty bad crash once too which taco'd my front rim, and after that the bike never tracked straight anymore.