strange tyre wear

[avonside]

Has anyone else experienced excessive scrubbing on the inside of the rear tyres.I have the replica 20's from eurotech and the Toyo Proxes, I have now covered nearly 30,000 on the tyres and had the car MOT tested last week and the technician reported that the rear tyres were dangerously worn on the insides.I have basically got a 45% flat worn on the inside edges of both tyres, the left is worse for some odd reason.Any ideas, I have allways thought the camber on the rears of X5,s looked too much but obviously it is for a reason.The concerning thing is that I can change the tyres but what caused the scrubbing in the first place.

[4.6is Ryder]

It's the negative camber of the rear wheels. This is normal with 19's and 20's. You can get a camber kit to adjust it. If you aren't driving aggressively you won't notice the adjustment. However, if you enjoy the thrill of driving, live with the negative camber....it's that way for a reason........Phil

[CharlieHustleX5]

I have 22" wheels and had abnormal scrubbing on my rear tires. I have been told that a wheel alignment will help reduce the wear. its not so much the camber thats killing the tires, its the incorrect toe that the new wheel and tire combo has presented.

[cocoabrova]

Yes, BMW's (E53's and E39's in particular) are known for having negative camber issues in the rear, but this is also one reason why the handle so well. Aside from the rear camber KIT like 4.6is Ryder mentioned, you pretty much have to live with it, or buy cheapy tires so that it don't hurt the wallet as much when you have to replace them....

[dkl]

Originally Posted by CharlieHustleX5

I have 22" wheels and had abnormal scrubbing on my rear tires. I have been told that a wheel alignment will help reduce the wear. its not so much the camber thats killing the tires, its the incorrect toe that the new wheel and tire combo has presented.

After going from 17" to 19" without an alignment done, the first set of tires with the 19" wore excessively on the inside edge as well. However, on my 2nd set of tires, I had an alignment performed immediately after tire installation. I noticed the alignment still had my camber set at the recommended -1.5 degree, but they dial out the toe settings to near 0. After 20k miles, the rears are still wearing very evenly without any excessive inside edge wear.

[Tomaz]

Also, to minimize inside tread wear, keep the tires inflated at exactly the stated pressure; 32 psi. I learned this lesson the hard way. Quickly wearing out a set of tires (15K miles) at 36 psi. I also had my mechanic dial out as much camber as possible, took about 5 minutes. No charge!

[peacemf]

Originally Posted by Tomaz

Also, to minimize inside tread wear, keep the tires inflated at exactly the stated pressure; 32 psi. I learned this lesson the hard way. Quickly wearing out a set of tires (15K miles) at 36 psi. I also had my mechanic dial out as much camber as possible, took about 5 minutes. No charge!

really? hmm, i better check my tyres again, cos last time (months ago) i inflated them more than the recommended amount

[dkl]

Tomaz, You're obsolutely right on tire pressure monitoring, but in most cases, it's tires dependent. So, some experimenting is necessary to find the optimum point. For example, I run 36psi on my previous set of Bridgestone Turanza without any issue with nearly even wear until near the end of it's life where it wore excessively on the inside edges (due to off-centered toe settings) - The Bridgestones actually wore faster on the inside edges when set to 32-33psi. However, I noticed right away on my current set of Pirelli Scorpion Asym. that they wore a bit more on the center of the tires when set to the same 36psi. The Pirellis seems happy at 32-33psi whereas the Bridgestones are at 36psi.

[Tomaz]

Originally Posted by dkl

Tomaz, You're obsolutely right on tire pressure monitoring, but in most cases, it's tires dependent. So, some experimenting is necessary to find the optimum point. For example, I run 36psi on my previous set of Bridgestone Turanza without any issue with nearly even wear until near the end of it's life where it wore excessively on the inside edges (due to off-centered toe settings) - The Bridgestones actually wore faster on the inside edges when set to 32-33psi. However, I noticed right away on my current set of Pirelli Scorpion Asym. that they wore a bit more on the center of the tires when set to the same 36psi. The Pirellis seems happy at 32-33psi whereas the Bridgestones are at 36psi.

Good point! I'm running Pirelli's @ 32 psi.