Originally Posted by Schwinnsta

Check this out. On my 2014 H model which I modded going from 12t 16t cogs to 12t 14t 19t cogs, I could go higher just by filing a small notch in the dropout. It would not compromise the integrity of the frame. I don't know if the B derailleur can shift higher or not. The answer on 3a is yes but no to getting the range of a six speed.