Why are my BMW 325i's runflat tyres wearing heavily on the insides?

I have a 2008 BMW 325i coupe with 19,000 miles. I told by Sytners that all four tyres have worn on the inside. The readings are O/S 5, middle 5, I/S 0. On questioning them they say this is a fault with Bridgestone runflats fitted to my car. What would be, in your opinion, the lifespan of tyres and if it is a fault should Bridgestone help with the cost of replacements?

Asked on 14 July 2010 by Malcolm Hayes

Answered by Honest John
It is definitely a problem caused by straddling speed cushions with low profile runflat tyres and probably why Bridgestone was unwilling to do a speed cushion tyres test.
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