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There is zero difference. My fronts are 255/40/21's and rears are 275/40/21's. So the only change I made from OEM was going from a 35 to 40. I was looking for a softer ride where I wouldn't feel every twig or crack I ran over. Mission accomplished.
Great post. Just picked up my 275/40/R21's today. The extra height on the tire was exactly what was looking for. I too got the Michelin's and paid 1,800. Praying that they last 70k miles like they are rated at. But the ride is so much smoother. Best money ever spent.