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Don't know if this has been an issue for any of y'all, and I don't know what the newer Shimanos Mr. Kirk referred to are like, but I found I couldn't get 7700 calipers to open up wide enough to let a larger tire in and out. Not with their QR open, not with the QR on the brake lever open too, not with the cable disconnected -- just not gonna happen. (Challenge Strada Bianca/H+Son TB14.)
I tried a Centaur dual-pivot and it offered plenty of room. But not wanting to anger the gods by putting Campy brakes on a Shimano bike, I broke out the belt sander and made a special set of extra-thin brake pads which allow me to pop the wheels off easily. Guess I have to check 'em for wear every year, instead of every two... I'll put up with that.
Doubtless there are other strategies, but the opening-upnitude of any given brake may be another factor you want to consider.
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