Wow, took a closer look at my 7 speed hub today. The gears are really messed UP. Teeth bent, teeth broken. I have a shift kit and always back off the throttle to shift and give the deraileur plenty of time to shift gears but MAN...they are MESSED UP. I'm guessing maybe, since I have a stretch frame and with the extra weight of the longer chain, the deraileur springs aren't quite strong enough to keep the chain tight like it should be...it seems to skip teeth from time to time....I don't know...Anyone else having a similar problem?