[lkchris]

Possibly an issue for we 986 owners is obtaining a new tire for our "donut" spares.

Yes, for the most part weight is the issue addressed by removing spare tires. For Mercedes diesels, the space for the spare tire is now used by the tank for "diesel fluid" (urea) injection into the exhaust system.

I doubt you'll soon see runflats on Porsches, as they'll likely not pass old Walter Rohrl's testing to be N-spec. They are for sure an increase in unsprung weight compared to conventional tires.

IMHO use of runflats rather assumes the whole world is urban. Where I live I can easily be 200 miles from a town with a car dealer and possibly a tire shop that can deal with runflat tires. It's nice that you can drive on a flat runflat tire, but that's limited to 50 miles at 50 mph and that doesn't work when I'm 200 miles away.

In addition, driving on a runflat tire that's flat ruins it ... so your simple puncture means buying a new tire if you do drive on it. Otherwise, it's call someone to come take it to be repaired if it's simply gone flat in your driveway.

Yes, haven't had an onroad flat since the 1960s, but I'm holding out for cars with spare tires. See ya BMW.