I had some scaffolding fall on my KHS a year ago and it made a pretty sizeable dent. The dent didn't affect the ride or mess anything up, it' sjust cosmetic damage. Anyway, I took it to many a bike shop here in NYC to ask their opinion. All of the bike shops said that they wouldn't mess with the dent. They could roll it out with a tibe roller, but that would just weaken the tube even more than the scaffolding falling on it......