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Old 11 May 2012, 14:47   #1
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Alarming Tyre Wear

Just incase any of you guys havent seen this problem, I thought I'd post.

I'm on my second BMW X5 .. first was an E53 model (pre 07) and my current one is the E70 version (post 07)

I tow now and again obviously, and am always checking tyres etc as you do. Never had any problems with the E53 that I was aware of, and had it for 4 years. The E70 is just gone four and a bit, and has done 23500 miles, not massive, anyway spotted the outer edges of the front tyres wearing heavily, a while back and checked the tracking but it was fine. Checked it again yesterday in a different shop and showed infact it was toed out slightly, so the wear was a mystery. When it was up on the ramp the real shocker was the condition of the rears .... from a visual inspection of the outside they looked fine, but thats not where they wear on this car, its the inside edges you need to look out for, due to the way the cars suspension is set up.

The rear axle wheels can be adjusted for camber and toe in on the axle subframes, and are factory set with negative camber to improve the cars road handeling performance, and there is no doubt , for a 4x4 its road grip is phenominal .. but it comes at a price of inner shoulder wear.

I had its 4 wheel geometry checked by my local BMW stealer, who confirmed the set up was pretty much perfect .... at a cost of 99.00 +VAT

Great .. that cost me 4 tyres today 1200, and you can expect to bin them when most of the tyres still have 4 to 5 mm of tread on them
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Old 11 May 2012, 14:57   #2
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That's quite some wear. Looks more like its been rubbing on the wheel arch rather than from the camber alone. Perhaps before the next set have worn too far you need to get them swapped from left to right to even it up a bit and get some more life out.
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Old 11 May 2012, 15:04   #3
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I think its a BMW thing, the price you pay for roadholding. I have exactly the same problem on my 330D Coupe and my wifes Mini, I fell for the BMW 4 wheel alignment trick on the Mini as well.
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Old 11 May 2012, 15:07   #4
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I would say there is something a miss that's not normal wear. My D4 scrubs the outer front but they all do
Can't you find an Indy to check it over.
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Old 11 May 2012, 15:11   #5
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I'd have thought you'd need about 45 of neg camber to wear them like that!

I have a Z4 which also has considerable negative camber and my rears wear on the inside more too but nothing compared to that. My rear tyres only last about 12000 miles till they are shot so you have done pretty well to get double that on a 2 tonne suv.

Does the X5 use runflats? If the pressures are too low the negative camber and rigid side walls makes them eat the inner edge much faster than it would on normal tyres.
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Old 11 May 2012, 15:42   #6
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My 120 wore badly on the outside and scrubbed a front set within 15k. When i took it back to kwik fit they said that the toe in/out was right. I said does it look right to you. They would not adjust it as it was over and above the factory settings.i told them that rear wheel drive vehicles have tendency to toe in and front wheel drive toe out.so can you toe out 2 degees to balance ot out. They woulnt so i did. I now get 30k out of the fronts!
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Old 11 May 2012, 16:28   #7
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Quote:
Originally Posted by Erin View Post
That's quite some wear. Looks more like its been rubbing on the wheel arch rather than from the camber alone.
YIK but they havent
Quote:
Originally Posted by Erin View Post
Perhaps before the next set have worn too far you need to get them swapped from left to right to even it up a bit and get some more life out.
They are 'sided' ... but I would seriously consider doing it just to even them up for sure... naturally everyone says 'dont' as it affects the handling

Quote:
Originally Posted by mick View Post
I would say there is something a miss that's not normal wear. My D4 scrubs the outer front but they all do
Can't you find an Indy to check it over.
It was an independant who checked it at first, but they are reluctant to diagnose anything as the geometry of such a car is so complex

Quote:
Originally Posted by Markyboyo View Post
Does the X5 use runflats? If the pressures are too low the negative camber and rigid side walls makes them eat the inner edge much faster than it would on normal tyres.
Yes they are run flats, and tbh they looked too hard to me but were at the manufactures pressure

Suffice to say, when I took it in for the alignment.. the girl on the desk didnt sound surprised at my predicament .. so I gues its not that uncommon ... but its a first for me .. and I'm quite particular about running around with dodgy tyres .. If Vosa pulled me with stuff like that on my 30 tonner, I'd be doing a stretch
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Old 11 May 2012, 16:40   #8
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http://www.bmwland.co.uk/forums/view...?f=24&t=114841
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Old 11 May 2012, 16:53   #9
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When I researched this problem .. I had a look on several BMW forums, one of which I am a member and contributer .. but I didnt find any that were specific ? .. cheers Mick
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Old 11 May 2012, 17:09   #10
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