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Old 12th January 2007, 06:34   #1
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Rear tire wear and alignment.

Actually two questions.

1) How many pairs of of rears do you typically go through per front pair.
2) What alignment is available on the M5 rear?

I have some Toyo T1R's on now. The fronts are around 6mm and the rears are down to 3mm on the left and 2mm on the right. The left rear is wearing evenly across but the right rear has extra wear on the inside. It could be I've been having way too much fun.
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Old 12th January 2007, 07:34   #2
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The rears wear almost 2x as fast as the fronts. The differential isn't as great with stock size front tires since they don't hold up as well to load. If you run rears on front, it's much closer to 2x but you can rotate them. I'm not sure what adjustments can be made to the rear alignment.
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Old 12th January 2007, 07:45   #3
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I had to dial out a bunch of rear camber on my old 540i/6 due to uneven tire wear. I'm going to assume the same adjustment can be done on the M. But I did read somewhere there is much less negative camber on the M5 as opposed to the 540i (BMW factory specs).
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Old 14th January 2007, 00:52   #4
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My rears wore faster than the fronts ... lasted about 80% of the time of the fronts ... even wear although a little more on the inside of rears ... (bought the car new).

I ran fairly high pressures - 40 front and 43 to 45 rear - mostly high speed longer trips ...
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Old 14th January 2007, 02:56   #5
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Many erroneously believe that the camber has a major impact on uneven wear... imperfect toe will scrub tires much faster than mild camber.

The BMW specs on toe allow way too much- don't just let then "check specs"- have them set it to ideal. Should be some threads in the FAQ sticky.

I'm running 275s front and rear, and rotating, so no reall difference. The 275s up front wear much more evenly than the 245s did...

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Old 14th January 2007, 04:52   #6
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Thanks for the input. I'll check the stickies for info on the rear alignment specs.

I just checked my mileage. I'll end up getting about 12k miles out of my rears and at the rate the fronts are wearing, I'll get about 15-18k out of them. In the meantime, I plan to order another pair of Toyo Proxes T1R's for the rears and have them ready. A couple mils of thread is not very much but I'm on winters right now so I'll put this off for a month or so.

I've got to give props to the Dunlop Wintersport M3's as well. Driving this weekend on sleet and snow has been completely uneventful. I don't think the DSC light flashed but a couple times and I was able to accelerate away in a straight line just like some other vehicles more known for their winter prowess.
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