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Do you mean you have gone from low profile to normal profile tyres?.I had Michelin normal profile run flat tyres on my honda and are no different in usage to the tyres that have replaced them the actual difference in construction the run flat have much stiffer side walls and weigh considerable more.Low profile whether they are run flat or not will tram line and amplify any bumbs.
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Would be great if you could post on your impressions on any effect on fuel consumption. Do the extra stiff sidewalls of RFTs contribute to lower rolling resistance which BMW quotes as part of Efficient Dynamics?
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In response to your question fortygreen, there has indeed been an improvement in fuel consumption by 1.5 mpg. over the 2k miles since fitting.
Whether this is due to the reduced weight of the conventional tyres over R.F.T`s but I believe it is more likely the result of less road drag by the conventional tyres, as road noise, which was quite high, has now almost disappeared.
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I thought it would other way round if anything, because BMW say their tyres are part of the ED package with low rolling resistance. So what size wheels/tyres do you have and what make of new tyre have you gone for? I'm on the original Bridgestone Potenzas on 18" rims. No probs with road noise, it's the tramlining I find alarming on certain stretches of motorway. All in all you seem to make a convincing case Dude for ditching the run-flats.
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