What would explain this tire wear? - BMW M5 Forum and M6 Forums
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post #1 of 7 Old 3rd July 2019, 03:57 PM Thread Starter
Kayotic
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What would explain this tire wear?

My front passenger side tire wore down the inside corner all the way to the steel belt. All the other tires are wearing great.

I took it into the shop today and looking at the before / after alignment specs, it doesn't look too bad. They did indicate that the front camber is completely maxed out with no more adjustment left to get it in spec. Could Low tire pressure create this type of wear?

Does anyone make camber plates that will allow more positive camber on our cars?

I'm currently running Bilstein inserts with Dinan springs, front / rear Dinan sway bars, and monoball front lower control arms.

And last question, what air pressure do you guys run on 19's? 245/30/19 Front and 245/35/19 Rear
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Last edited by Kayotic; 3rd July 2019 at 05:07 PM.
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post #2 of 7 Old 4th July 2019, 01:31 AM
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I can't read the numbers but that looks like an awful lot of toe-in.

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post #3 of 7 Old 4th July 2019, 12:20 PM
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This was mine (front drivers side UK) back in March, I only spotted it when actually changing all four tyres, as normally I park with the wheels parallel so a cursory glance always meant it looked fine....

I went and had the alignment checked and all was within specification, all the tyres guys could think of was that low pressure allowed it to happen - as occasionally that tyre would be down by 10 psi yet when checked in a bath there was no sign of leakage - again surmising we had to put it down to the pot holes and crappy roads here in my part of the UK that were causing forced air escape. Having had broken Macpherson struts a couple time over the last 12 month it's a possibility.

The other 3 tyres had all worn evenly across the surface, this one was a real anomaly...
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post #4 of 7 Old 4th July 2019, 02:16 PM
caslvre39
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fix the camber or whatever bent on that side, run less front toe and more front tire air pressure.

they dunked that tire and never mentioned the inner wear occurring ? what are the number and psi you set your car to.
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post #5 of 7 Old 4th July 2019, 06:10 PM
josiahg52
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What does "within specification" actually mean? The specification window is large and exists for the convenience of the technician.. At one end tire wear can be minimized and at the other end, not so much.

I've run camber of -2.0 in the front and -2.5 in the rear and didn't experience that kind of tire wear. Too much toe in and went through a set of rear tires quickly due to excessive inner tire wear because of excessive toe in. I don't go to that shop any longer.

From the factory, camber is not directly adjustable in the front. I'd find a different shop if they're telling you "the front camber is completely maxed out with no more adjustment left." It could be a simple mistake but did they even try to adjust it? What were they adjusting if they tried?

The difference side to side is interesting and ultimately the camber measurement can be affected by the other adjustments made in the front. There are numerous companies that offer camber plates for the E39 M5 of you want to go that route but I'm guessing you have other problems that may be attributing to the tire wear. I'd also be surprised if the other tires don't show abnormal but not excessive wear.

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post #6 of 7 Old 4th July 2019, 06:12 PM
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Quote:
Originally Posted by caslvre39 View Post
fix the camber or whatever bent on that side, run less front toe and more front tire air pressure.

they dunked that tire and never mentioned the inner wear occurring ? what are the number and psi you set your car to.
You bring up another reason why I'd look at another service provider.

Judging by the 'Before' pressures, I don't think they're set to anything.

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post #7 of 7 Old 4th July 2019, 08:43 PM
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Another vote for take it some where else and get another opinion. Looks like the total toe might be transferring all to one side, that can happen if you have a loose joint and it often happens to the tire on the low side of the road crown, this depends on how you drive the crown. I would go to a place and watch that they really inspect for loose parts with a bar, visual or just hands counts as zero in my book.
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