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      10-07-2010, 09:02 AM   #1
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Difference between OEM M3 PS2 and normal PS2

I apologize in advanced because I'm sure this has been discussed before, but I did search. What is the difference between the Michelin PS2s that come on the M3 and the normal Michelin PS2?
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      10-13-2010, 05:04 AM   #2
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1. Compound and side walls are different - according to Michelin

2. The biggest different would be the load rating for the rear tires. Normal PS2s 265/35/19, assuming 19", have a load rating of (94Y) - approx 1450lb while M3 spec's load rating is (98Y) - approx 1650lb. Front tires are the same. You can check and michelin website.

Unfortunately, it's difficult to come across good rear tires with this load rating in certain parts of the world. I have that difficultly and my alternative choice was Pirelli Pzero which meets the M3 OEM requirement (load rating, speed rating, etc...) The other alternative which means everything except for the speeding is Bridgestones RE011. I'm not really sure how speed rating and load rating affects the car, but I rather be safe than sorry. I do track the car and high speed driving. I do hit the occasional 170mph for a couple of seconds. But mostly cruise around 100mph to 120mph on the highway.
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      10-13-2010, 01:24 PM   #3

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If you want to maintain or raise the load rating without getting the OEM PS2, you can upsize. If you go with the 275/35/19 PS2 (which fits on the OEM wheel), the load rating goes to 100 or 1764lbs.
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      10-13-2010, 09:16 PM   #4
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The Sumitomo HTRZIII have sufficient load specs. 4/5 of the performance of the PS2, but a lot cheaper.
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      10-13-2010, 10:10 PM   #5
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Unless you're going to have fat passengers on the rear, plus a full trunk, you don't need a 98 load rating. In fact, you'd be over the GVWR with the 94 load rating of 1,450-lbs per tire anyway, so why the hell 98? And same with the speed rating; US cars are limited to 155 mph, so why a Y rating of 186 mph SUSTAINED? Even a Z rated tire is overkill with 168 mph sustained. Any 94Z tire exceeds both top speed and GVWR on our cars; no need for more, especially if you never carry passengers in the rear, like me (and the front ones are light ).
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      10-14-2010, 02:06 AM   #6
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Would it be possible that a 94Y tire vs a 98Y tire, the 98Y tires have stiffer sidewalls?
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      10-14-2010, 05:48 AM   #7
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