Tire concerns: Difference in tire size between a 40 and a 35??
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Editorial Comment:
If you calculate the tire sidewall height of each of these two tire sizes, you'll find that they are almost exactly the same. (315 x 0.35 and 285 x 0.4 both come out to apx 110 mm.)
So, the back will not be anywhere lower than the front and you'd not likely be able to notice any visual difference when looking at them.
The only possible problem might come from the mounting of the wider tire on your rims. I don't have the specs available for each of these tires, but supposing that the narrower tire is using the ideal rim, then it seems that the wider tire should be acceptable for that rim. The best bet is to ask your dealer to tell you what is the recommended and acceptable rim width for each of these tires.
TG