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99 E430
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I have 18 inch AMG Monoblocks and Sumitomo 235/40's. I have had a 4 wheel alignment since replacement of shocks and bushings. Everything is stock (99 E430 Sport). I am consistently getting maybe 7k out of the rear tires, with even tire wear. The car drives and tracks good. I figure maybe 2x that for the fronts, so 14k. If I drive 15k a year, I will end up buying 2 sets for the front, and 3 sets for the rear for a total of 10 tires before the end of the year. At a minimum price of $150 per tire installed, that is $1,500.

Due to that expense, I am thinking of getting used 16"s off eBay, and keeping the 18" for secondary use, or getting 17"s and selling my 18"s. How many more miles could I get out 17" rear tires versus 18"?

I am also considering replacing my 18" Sumitomo's with with Goodyear's Eagle GT's with a 50k mileage warranty. Not sure how good trying to claim on the warranty would work.

Also, I see most for AMG Monoblocks, the rear wheels are slightly wider than the fronts. I don't know I mine are that way or not, but if so, does it hurt to rotate the front and rears on each side? Is there any toe in/out adjustment on the rears?
Thanks
 

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W210.265/2001, W220/S500/2000, Porsche 997 C2S/2006, GMC K1500/1992
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2,157 Posts
I do not know why your rear only run 7K miles. Even my 19" Rear continental gives me more than 25K in my Porsche. (Rear motor). My 19" front still have plenty of thread left at 38.5K. All of my tires are 165 mph+. I am using 16" in my E and the tire has 400/AAA/97W, Achilles ATR, 348/4. But the S is using 245/45/18 Kumo ASX,420/AAA/100W,$520/4, 420=60K miles warranty. It cost me $632 installed.
 
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