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Old 12-11-2012, 06:01 PM
TXFred TXFred is offline
Officially Welcomed to the 'Fest
Location: Austin, TX
Join Date: Apr 2012
Posts: 236
Mein Auto: 2008 335i Convertible
Originally Posted by Zooks527 View Post
They become unsafe to repair if they've been run while flat, and as there's no way for the shop to tell if you have done so, many will not take your word for it and accept the liability.
I'm going to take issue with this, based on my expertise.

My qualifications:
1. I think I know what I'm talking about.

I've had the distinct pleasure of destroying a run-flat tire. This was less than a week after I got my 335i. I had a nail in the right rear, and before I could get it repaired, I had an emergency. As a result of this, I had to drive 7 miles at about 90mph, on a flat run-flat.

(In hindsight, I should have taken two minutes to fire up the air compressor and re-inflate the tire. But bad things were happening, and I was panicked.)

Later, I took the car in to Discount Tire to have it patched, and the damage was very obvious. The inside of the tire was filled with what looked like black ball bearings. These were composed of rubber dust that had reformed into little balls as the tire rotated. The inside of the sidewalls was visibly damaged, with a crack running the entire way around each sidewall. This was the source of the dust.

From the outside, the tire looked just fine.

Seeing the damage, Discount Tire quite correctly refused to re-mount the tire. I bought a new one.

The point of this is, if you drive on your run-flat fast enough or long enough to damage it, the damage will be obvious when the tire is dismounted for repair.

Any idiot can be fast in a straight line. The corners are what separates the drivers from the commuters.

Last edited by TXFred; 12-11-2012 at 06:02 PM.
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