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JCL · #2 06-15-2007, 07:36 PM

I don't agree with your recommendation to run it when you get a flat, that can be very expensive.

I don't know if the Dunlops are different, but in general, run-flats can be repaired. The issue is that if a run-flat has been driven on for a period of time, it is weakened and can not then be repaired. If you get it to the side of the road and don't drive an extended distance on it, it is generally fine. My local tire store (a multi-brand store, but my tires were Bridgestone) is certified to fix run-flats. Their guidance was, not less than 21 psi, and they asked about speed and distance as well.

All this assumes that the nail is in the tread, and not the sidewall. The approved repair uses a 'mushroom plug' which is a combination of plug and inside patch (one piece). The tire must be dismounted to perform this repair.

BMW and other other car dealers will generally not be trained in repairing run-flats, you will need to deal with a good tire shop. There is also a liability issue at play here; it is safer for them to replace the tire. If they fix it, assuming they are trained to do so, then they need to satisfy themselves that you did not in fact run it to zero pressure and weaken it, due to the liability that they are assuming in repairing a run-flat and sending you on your way. My tire shop asked me what pressure it dropped to (I knew, as I carried a tire gauge) and asked how many km it had travelled. They inspected the tire, satisfied themselves, and proceeded to fix it. When asked, they responded that the speed rating was not reduced, and that the tire was functionally as good as new. Do a search on all the X5world forums and you will see several threads on this subject.

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