Originally Posted by
Homebrew01
If you already have a 34 small ring (compact), why would you switch to 39 (which is not compact) ?
Or the hills are too easy and your gears are currently too low ?
There's no way he has a 53/34 now; I can't imagine anything handling a 19t differential. He must have just mixed up the standard and compact gearing. If he has that sort of gearing there are bigger problems here than climbing.