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Seat stay bridges presumably more so?
I have a frame that has decent clearance for 42c tyres but rizla at the bridge. I'd like to replace it with one which has a guard mount but wouldn't mind just removing it and putting an m5 boss on each stay and then using a removable guard mount bridge as seen on some Cannondales but I don't want to turn a nice 853 frame into a wet noodle.
PhilDAS
We measured deflection on our surface plate with some weights hanging off the back of the rear end of a frame, with and without a bridge. There wasn't any difference. Obvs not particularly thorough, but I don't think they make any difference