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  #1  
Old 11-20-2017, 12:37 AM
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Tires

On my 645Ci I have run flat tires.

All new less than a year ago. I haven't done a huge mileage since then.

Now my tire guy says the rear tires are worn out on the inside.

These were not cheap tires. Big suckers, low profile, run flat.
This guy is telling me that because of the setup on modern European
cars, this is what happens.

I can't believe the vehicle manufacturers would design their vehicles such that tires last less than a year of normal usage.

Any tire experts out there ??
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  #2  
Old 11-20-2017, 12:54 AM
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Show us a picture of the tread on your tires if you can.

There are many factors that can contribute to uneven wear on tires. One of them is camber, which all BMW's come with to help with better handling. The rear tires will wear quicker than the fronts, you can swap the rear tires side-to-side every oil change to get longer wear.

Also, main thing is to make sure your alignment is up to date (a least once a year) and suspension are in good working order, worn bushings or bent control arms can cause alignment to be out of wack and cause accelerated wear.
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Aftermarket: Dinan Tunes/Camber Plates/Strutbar, KW coilovers, 22" ACS wheels, Eibach F+R swaybars, Thayer Camber+Toe bars, Stoptech F+R BBK, Audison/JL Audio/Critical Mass Audio, Eisenmann Exhaust
OEM: LCI Conversion, Running Boards, Euro Headlights, Lemans flares, 4.8IS F+R bumpers w/ flares, 20" Style 214 wheels, Imola Red interior retrofit, LCI Heated Wheel

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Old 11-20-2017, 05:29 PM
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Thanks for info.
My tires cannot be turned around on the rims.
The same side must always face out.

I've talked to a few other guys and apparently this wear problem is quite common.
The camber is set pretty aggressively and so it is quite common that you get wear on one side of the tire.

However there is some adjustment.

My front tires are Goodyear Excellence 275/35R19 (Asymmetric) 96 XL
Rear tires are Goodyear Excellence 275/40R19 (Asymmetric) 94Y
All are Run Flat.

I don't intend to take the car on the track or do any stupid driving.
Therefore I was thinking of asking the guys to back off the camber just a little to help improve the life of the tires.

What do you think about that idea ?

Here is link to a picture. (Sorry, it doesn't show much)

https://www.dropbox.com/sh/2xo5ru383...0kSkSuAUa?dl=0

If you follow the Goodyear link above, you can see the difference.

Tires have done 25,000km's since being fitted. (About 15k miles)
Purchased April last year.
My traction control (DSC) was not working for some time (now fixed), so that meant I had wheel spin on several occasions. That wouldn't have helped.

Last edited by kavala; 11-20-2017 at 06:32 PM.
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Old 11-20-2017, 06:08 PM
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Hey, so what I was referring to was actually dismounting the rear tires from whe rims/wheels, and moving them side to side.

Slow day at work so I created a picture/diagram to better see it (below).

So I have been doing this on my RWD cars for quite some time and I have gained at least 7-10k more miles through my tires.

Also, I know we don't have spare tires in a lot of the newer BMW's, but ditching the run flats, and going with conventional tires are not only cheaper, but the ride quality is much improved. I carry a BMW mobility kit in the vehicles that do not have run flats any longer, and between the kit and AAA, I have had no issues.

Good luck!
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2001 Topaz Blue X5 3.0i Current 2017-
Aftermarket: Dinan Tunes/Camber Plates/Strutbar, KW coilovers, 22" ACS wheels, Eibach F+R swaybars, Thayer Camber+Toe bars, Stoptech F+R BBK, Audison/JL Audio/Critical Mass Audio, Eisenmann Exhaust
OEM: LCI Conversion, Running Boards, Euro Headlights, Lemans flares, 4.8IS F+R bumpers w/ flares, 20" Style 214 wheels, Imola Red interior retrofit, LCI Heated Wheel

2002 Topaz Blue X5 3.0i Retired 2002-2010
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Old 11-20-2017, 06:29 PM
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Thanks again for your helpful advice.
I can't swap my tires as you suggest because the same sidewall has to always face out, regardless of which side of the vehicle I put the tires on.

The yellow areas in your diagram have been moved to the outside of the car.
I can't do that.

Yes, I know what you mean about the Run-flats. I feel that they are noisy
also. The mobility kit would be okay for slow leaks I guess.
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Old 03-30-2018, 08:39 AM
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Not an expert of the tires, but I would suggest you to look into your car’s user manual and find out about your tires. If these are within the warranty period, you can get them replaced. Also, if you do not possess the user manual, you can get a copy of it online from manuals.co- the online website which delivers all kinds of car manuals absolutely free of costs.
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