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Rear tyre wear on inside edge

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Hi all,

 

Thought I'd post in my old 5 section even though i now have a 7 cause you lot are very responsive bunch :-)

 

Took my car in for it's MOT last Saturday thinking it would sail through but shockingly it failed due to both rears being worn down to the threads on their inside edges. I had it 4 wheel (hunter) aligned last summer so it really surprised me...Anyway, I decided to bite the bullet and change all 4 to non runflats (tyres on order) as this was my long term plan anyway but am left scratching my head as to what suspension parts could be to blame as tyre pressures etc are checked every fortnight etc?

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Tyres wearing like that can be down to a number of things, mainly incorrect toe-in or toe-out, but those are rarely adjustable at the rear. Same goes for caster. Camber adjustment could be possible and this could be a possible culprit. I had my runflats swapped for non-runflats, and my local tyre fitter commented that they see loads of runflats wearing at the edges. He explained that it's due to the very stiff sidewalls not allowing the load to be spread evenly across the whole tyre, which does make sense when you think about it. 

I'd get another hunter alignment done and monitor the tyres. 

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5 hours ago, Steve-Savalas said:

had my runflats swapped for non-runflats, and my local tyre fitter commented that they see loads of runflats wearing at the edges. He explained that it's due to the very stiff sidewalls not allowing the load to be spread evenly across the whole tyre, which does make sense when you think about it. 

As above. I had exactly the same on my 530d. Tyre people said same, common with run flats. I have changed to non-run flats on 545i and no issues plus quieter and more comfortable ride. 

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My E60 with spot on wheel alignment and 9" wide rear tyres would wear them down to the canvas in 22k miles. 

 

These were OEM Dunlop, not cheap nasty ditch finders. Alignment was checked regularly and car was pin sharp to drive so I know nothing was out.

 

Anything with a bit of twist and wide rear tyres will wear them out on the inner edges.

 

Although same width of tyres on the F10 and no wear on inner edges. 

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On 3/20/2018 at 7:45 PM, Steve-Savalas said:

Tyres wearing like that can be down to a number of things, mainly incorrect toe-in or toe-out, but those are rarely adjustable at the rear. Same goes for caster. Camber adjustment could be possible and this could be a possible culprit. I had my runflats swapped for non-runflats, and my local tyre fitter commented that they see loads of runflats wearing at the edges. He explained that it's due to the very stiff sidewalls not allowing the load to be spread evenly across the whole tyre, which does make sense when you think about it. 

I'd get another hunter alignment done and monitor the tyres. 

On E39 both are adjustable via eccentric bolts - my inner tyre wear was resolved when the (experienced) hammer guy changed agressive sports set-up to more lenient SE values. His suggestion btw. 

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13 hours ago, Steve-Savalas said:

It wasn't adjustable on my e39 but the tech guy said it depended on the model. Maybe M-Sport models are adjustable and others aren't...

 

No your tech is talking mince.

 

All E39s and E60s regardless of trim/spec have cam headed bolts or cam shaped (eccentric) washers to allow the rear suspension arms to be adjusted.

 

http://www.realoem.com/bmw/enUS/showparts?id=DD42-EUR-06-1998-E39-BMW-523i&diagId=33_0519

 

show your tech how many time the word "eccentric" is shown on the parts list in the above link and them don't go back to that garage.

 

 

 

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The rear camber setting is usually the culprit for edge wear on the rear tyres.

 

An aggressive camber setting improves cornering but causes wear on the inner edge. The BMW specs for the rear camber are quite loose so one car could have quite a lot of negative camber (with tyre wear) and still be in spec and another car could have a lot less camber and still be in spec.

 

As the car ages everything tends to sag a little and the camber increases, possibly still in spec though so an alignment may not flag it as an issue.

 

You need to go to an alignment specialist or a garage that knows what they are doing and get the rear camber adjusted. In theory it just involves loosening a couple of nuts and turning some bolts....however the bolt can seize into the bush making adjustment impossible without getting the bush replaced.

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1 hour ago, sshooie said:

Had 4 advisories last mot on my F11, both fronts wearing on the outside, both rears wearing on the inside. 

 

 

Rotate your tyres, problem solved. B)

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20 hours ago, sshooie said:

Had 4 advisories last mot on my F11, both fronts wearing on the outside, both rears wearing on the inside. 

 

 

That is how mine wears as well/

 

Rotation isn't an option for me, a staggered set-up. Oh how I hate that.

 

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Tyres changed on friday last week...4 wheel alignment done this morning using a hunter machine and all in the green, front and back following adjustment.

 

Car is sooooo much smoother on non run flats. I thought the 5 series was smooth on non RF's but the 7 is real nice :-)

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