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@HarmanMogul
Yes RD is capable of 40T big cog I think. But hell, why not just fit the manufacturer setup. Anyone here in need of a nearly-new 3x9 group? Perfect for the retro MTB crew — 22x28 low gear, what's not to like!
Edit: M772 SGS is specified only for 34T big sprocket, with up to 22T diff between rings. So you are right @vilms5000. Works well in my setup though!