rear tire wear

[cmartin248]

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.