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jj72-
That's the polite version! Butseriouslytho... bits of grit and stuff picked up off the road will obviously scratch up the brake and if I break a spoke it's more likely to rub than a caliper with more clearance, but other than that is there a safety issue? Locking up the back wheel if a really big stone got stuck in there would be bad, but not as bad as if it were the front wheel.
ffm
What's a sensible clearance to have between the back tyre of a road bike and the "arch" of the back brake caliper?