I thought all car guys knew this but here goes:
The numbers 40 and 45 in above tire sizes are PERCENTAGE of the tire width, which makes the 285/40 114 mm high, and the 255/45 is 114,75 mm high, a tad higher but not noticeable.
So yes I was right, the front is taller, no need to be condescending, I guess what I don't understand is why not use the same size then on all four corners...
I'm sorry if I came off as condescending, must be a language thing, english is not my native language, it was not my intention.
Yes you were right, the 255-45 is higher than 285-40, by 0,0295 inches (0,75 mm), was it this you pointed out? To me, that is pretty darn close, it's the thickness of a nail, sheet metal or the graphite rod in a graphite pen, as I said, not noticeable. You will probably wear off more rubber in a couple of burnouts.