The contact patch would remain virtually identical under a load (assuming standard inflation), but the section width would be reduced by 2/10 of an inch. Section width is measured at the widest part of the tire which would be approximately mid-way between the rim and where the contact patch begins (particularly on a tire fitted to the small end of it's recommended wheel width). Also consider that many tires (like my current tires) have a rounded shoulder design, so I could pick a tire that doesn't have this design and the contact patch would be wider than what I've got now with the stock TT wheels.
