as a Clyde I'm always sensitive to being too heavy for the frame, wheels, tires, etc I'm riding.
last week I switched from 32s on my commuter to 28s. the new tires, while at full inflation (85psi), seem to "bulge" more than my 32s did...and also more than the 25s on my road bike (though at higher pressure - 125).
by "bulge" I of course mean that the part of the tire that touches the ground flattens out a bit.
should I worry about the bulge? obviously if the rim were touching the road that would be bad, but short of that I'd love to put it out of my mind.