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Is that damage on the inside only, or both sides?
If inside only, then I would suspect that as is has deflated and the tyre wall bulged out under the heavy E34 weight, it has touched and worn against the strut or exhaust. (He says, rapidly editing post after reading mmmfives better alternative explanation which he wrote whilst I was also typing...)
When you next take the wheel off, you will be able to see.
Either the paint from the strut will be gone, of you will notice a nice shiny patch on the side weld of the main rear exhaust silencer.
(Don't worry, that weld is deep and solid, you won't have damaged the exhaust.)
Regards
Ivan.
P.S. Whilst you are looking at the exhaust, it is time for every M5 owner to do their 6 monthly check that neither of the centre leather/rubber hangers have snapped and that the twin rear silencer/muffler brackets are still there and their rubber donuts are in good condition.
If centre hanger rubbers are snapped or have been bounced away by speedhumps, bear in mind there are two types, standard BMW rubber-looking ones only which work temporarily, and a reinforced leather/rubber/stitching one which the E34 M5 should be using.
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"Never enter Karussell when on the brakes! I have gone round there on the roof, I know what I'm talking about." ~ Sabine Schmitz
Last edited by IvanDias; 10th January 2008 at 11:30.
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