All I see these days are 'compact' cranksets with 34-50 rings (or 36-50). Are there any ultra-compact cranksets compatible with 11spd drivetrains? E.g. 30-46, or 28-42 like on a mtb, or even better something like 28-44 or 26-42 ? I understand there is a BCD issue, so is there any 11spd offering with low gears, which would be perfect for touring people? And if there is anything available, what front derailleur would you use? This is for a standard road bike that currently has 10+y old DA7803 on it. Thanks!