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My recently purchased 330i has Pirelli P Zero RFTs. This is my first experience of run-flats. It's perhaps invidious to make back-to-back comparisons between different cars, but I don't find the P Zeros much noisier than the (nearly new) Michelin PS4s on my Jaguar XF. The ride is harder even in Comfort setting, but that could well be the car (M Sport, adaptive suspension). On the Jaguar - which has adaptive dampers - the PS4s are noisier and slightly harder-riding than my previous Dunlop SP Sport 01(J)s but its worth the trade-off as they're so much grippier, especially on wet roads, and the steering is a noticeable improvement in all conditions - more fluid and communicative. I haven't driven on the P Zeros in the wet as yet, so I'll be interested in the comparison on familiar roads.
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