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malandro-
The current Shimano 105 brakes are compatible with 28mm tyres according to Shimano:
"the SHIMANO 105 R7000 caliper stops with a predictable, linear braking curve thanks to its sleek design. It is compatible with 28mm tires and both traditional and direct mount options"
I have this brake on two bikes and there is heaps of clearance between a 28mm tyre and the brake (much more than between the tyre and underside of fork). Could probably fit a 30mm tyre if the forks had more clearance. (Possibly it was different on previous versions, hence @edscoble 's reply.)
hullian
Shimano brakes, also don’t recommend 28mm, even if it fit, it will rub on the inside of the fork when the wheel flex.