I did, and thus my question.
The tires are 255/35/18 on the rear, which should have a sidewall of 255x0.35 = 89.25 mm, while the fronts which are 225/40/18 should have a sidewall of 225x0.40 = 90 mm, thus their rolling diamters should be almost exactly the same on 18 inch wheels.
There is a mistake here, either in the tires or the wheels or the photographs.
If you don't understand what I am saying, please consult somebody.