Front to rear needs to be within the below 4% range. The 225/40 255/35 is .5% +/- of eachother depending on tire manufacturer. Being slightly shorter tires overall will reflect your speed slightly due to a smaller rolling diameter.
I run 225/35/19 and 265/30/19 due to my ride height and there have been no ill effects for 15,000 miles and ive been lowered 5" for a year, i also run 235/40/18 square on my stock staggered M sport wheels for snows.
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