Originally Posted by SesameCrunch
I have a couple of folding bikes with 9 speed drivetrain. The short "wheelbase" on these 20" tire folders means an even more severe angle on the chain than a conventional bike. Both work fine on all 9 cogs. Caveat: I have to have an FD even though they're single chainring to stop occasional chain drop, but that's a short bike issue.
Same here except with 7 and 8 cog cassettes. You should skip the FD and get this little doohickey:
from
Thor. Say goodbye to chain drops.