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Thanks for the replies. In my post I said that I was using regular P7 tires. By that I meant non-runflats. Run-flats were standard equipment on my last three BMWs and I immediately replaced them with regular(non-run-flat) tires in each case. But even so, the suspension, and especially the rear 704 suspension on the 540, tends to bounce or hop over small road irregularities when the tire-pressure is as recommended. Can’t describe it better. Regarding going to 245/45s, the inherent error always built in to our BMW speedometers would actually be largely corrected by that change, not made worse. Anyway, I’ve been reading about the two newer tires, one by Bridgestone and the other by Vredestein(?), which are both getting rave reviews for their comfort. Maybe that’s the way to go.
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