is it just me or does it seem that the conversions that aren't having problems are a different issue... the frame design should put the pedals higher on the fixed frames...

and the reason road frames don't have a problem is because people know what pedal strike and can do and lean accordingly. i stroke a few times when turning into an incline(leaning into a curved incline) and quickly learned not to lean that much. if anyone has a frame mentioned in the OP with 170 cranks, that would be more helpful.