rear tire wear

cmartin248 · #1 08-05-2007, 09:06 AM

Recently purchased a new set of tires to replace the ones that had only worn on the inside. The new tires have about 5000 miles on them and are showing severe wear on the inside rear. The front tires are fine with even wear. It appears that BMW put a lot of negative camber on the rear, probably for 2 reasons; improve handling in extreme conditions and help prevent roll over with low air pressure. If you are like me and drive normally and check my air pressures weekly, then maybe you can get even wear like I did. Use a floor jack under the rear differential and lift both rear tires. This isn't totally necessary but it gives you a lot more room to get to the camber bolts. The camber bolts are located on the lower inside of the swing arm. They have cam washers which rotate and pull the swing arm in and out. You must loosen the nut first, you can't hold the nut and loosen the bolt. After the nut is loose, rotate the bolt until you pull the swing arm in as much as possible. Tighten the nut while holding the bolt and pat yourself on the back, because your tires will last 40k instead of 10k... the nut is 21mm and the bolt 18mm, sort of hard to find, you can use a 13/16 on the nut and 11/16 on the bolt.

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jst2878 · #2 08-05-2007, 09:38 AM

Awesome advice. I will be jacking my car up as soon as I get back outside. I noticed the same wear and had the tires flipped on the rears. I took all of the negative camber off my Honda civic when I installed new coilovers with the help of an adjustable control arm for the front and adjustable endlinks on the rear. I was able to cruise on the expressway in turns with ease. I don't think the X will have a problem with flipping after this minor(but needed!) adjustment.

jst2878 · #3 08-05-2007, 09:46 AM

CharlieHustleX5 · #4 10-03-2008, 01:27 PM

Can anyone else confirm this method works?

X5rolls · #5 10-03-2008, 01:53 PM

I have a different tread wear issue with the 315/35/R20 rear tires. The center of the tire is wearing more rapidly. I think I read someplace that it was due to the fact that the BMW V spoke 168 rims are 10.5 inch vs. 11 inch which are not offered. Anyone familiar with this wear issue and is it due to the less than optimal rim width of 10.5 inches?

jst2878 · #6 10-03-2008, 06:27 PM

Center wear is made by overinflation of the tires and driving on them for thousands of miles. check your tire pressure once a month 35 front and rear is good

Quote:

Originally Posted by X5rolls

I have a different tread wear issue with the 315/35/R20 rear tires. The center of the tire is wearing more rapidly. I think I read someplace that it was due to the fact that the BMW V spoke 168 rims are 10.5 inch vs. 11 inch which are not offered. Anyone familiar with this wear issue and is it due to the less than optimal rim width of 10.5 inches?

X5rolls · #7 10-03-2008, 06:42 PM

Quote:

Originally Posted by jst2878

Center wear is made by overinflation of the tires and driving on them for thousands of miles. check your tire pressure once a month 35 front and rear is good

. I checked the pressure and of course you are right - I thought I had the right pressure but nope. It's 35 rear, 32 front. I feel pretty stupid given I didn't check first.

Now I'll go check the other vehicles. With the air pressure monitors I think I've become lazy.

williamssk123 · #8 10-04-2008, 12:06 AM

i had insain inside rear tire wear. I asked around till i found some one that had a great rep and would align the truck as straight as possible outside. of bmw specs. I have had no problems and drives the exact same. I have replaced the tires and rims with with 22s with a 315/30/22 rear tire. With 5000 miles I have pefect rear tire wear and a factory ride.

CharlieHustleX5 · #9 10-04-2008, 10:56 AM

Its almost impossible to find someone to align an x5 with 22" wheels correctly. I've already had 2 shops try to align the wheels and I still have abnormal rear tire wear. Now the fronts are wearing a little odd but i'm beginning to suspect suspension components are wearing out a little.

williamssk123 · #10 10-04-2008, 03:48 PM

Quote:

Originally Posted by CharlieHustleX5

Its almost impossible to find someone to align an x5 with 22" wheels correctly. I've already had 2 shops try to align the wheels and I still have abnormal rear tire wear. Now the fronts are wearing a little odd but i'm beginning to suspect suspension components are wearing out a little.

The tire shop would not align it with the 22's I had to put on my 18's for them to clap the things to the wheels

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