Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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Originally Posted by Dural
You can do at least: 32t with a 42/53,
Maybe, maybe not.
In addition to the chain wrap issue there is also a largest cog capability. Shimano rates their road derailleurs, regardless of long or short arms, for a 27 tooth maximum rear cog. Like Al1943 said, you can generally cheat a little on that but 32 teeth is quite a bit of cheating.
The bottom line is that, if I already owned the derailleur, I'd try it to see if I could make it work to my satisfaction. If I were buying a derailleur, I'd be sure to get one that was rated for the gear combination that I was using.