Originally Posted by
cycle_maven
Changing to a triple (low gear 30:27):
Or 24:27, like 34x38 which does not exist.
Or to match the low of 38x30 from 13-14-15-17-19-21-24-27-30 you could run 30:23 from 13-14-15-16-17-18-19-21-23
Cost for the change depends on what the used parts sell for if they don't end up on a shelf in the garage.