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@HatBeard
it may depend on the brake shoe i guess.
fwiw I currently have a 38c with knobblies on the back of my roller and there's 3mm clearance from the brake bridge. could have put another link on the chain to get some more but it would have put it right on the edge of the dropouts. on the front i can run a 35c with front brake (miche long drop jobbie) with no issues (although it touched the tyre slightly when braking before i put new brake pads on.