Okay so it sounds like if I also move the derailleur from bike 1 over, then I should have a matching set and the indexing would work, but I worry that would create other issues:
- I might need to shorten the chain as the short cage will not take up as much slack. Not a big deal except I don't have a chain breaking tool right now.
- I understand there might be issues with using a short cage derailleur if there are three front gears?
Sound about right?
Thanks for all the replies so far.
Right now it works reasonably well so I might just leave it as is, I only use it for a 10 minute commute each way over pretty level ground.