How much leeway do you think there is between "chainline not perfect" and "chain falling off at random"? I really am after a "for now" solution - I may love the bike as a single speed and want to tart it up as such, but I may not... One thing is for sure, just at the moment I can't afford to make the changes and upgrades I'd like to if this bike stays geared, and I haven't been on a ride on it that's needed more than three gears all year!