Originally Posted by
Bill Kapaun
Likely the existing FDER will shift "good enough".
Indeed. My cargo bike has a 24-36-chainguard combo in the front and there's tons of room between the "big" chainring and the front derailleur. (Below.) It shifts just fine.
In the rear, IRD offers 9-speed cassettes in 12-32 and 12-34 combos:
https://store.interlocracing.com/bllica.html . I have the 12-34 on another bike and it's working fine.
