I think there is no limit to how small the chainrings are, just the difference between the two chainrings. Because if you have tiny chainrings you can just shorten the chain. But with a large tooth gap a short cage rear derailleur would not be able to take up the slack.
I think there is no limit to how small the chainrings are, just the difference between the two chainrings. Because if you have tiny chainrings you can just shorten the chain. But with a large tooth gap a short cage rear derailleur would not be able to take up the slack.