Thanks for the info. What I find interesting is that BMW actually
planned for a spare tire in the E90/92 in some markets. Obviously, its
hoping that everybody buys into the run-flat tire craze and forget
about a spare. Reminds me of the late 80s when BMW was one of 2 or 3
companies pushing TRX wheels and tires. Everyone I know who had a 5 or
6 series with those wheels ended up trashing them and buying regular
wheels. Nobody wanted to spend $400+ for a tire that is basically
obsolete and now only made by one company is very small batches.
Hopefully, the run-flat craze will be more popular....
Yes, it seems that they acknowledge that in some markets, one might need a
spare, seeing that those pesky Self Supporting 'run-flats' can only survive
up to 90 miles at a maximum speed of 50 mph, depending upon load in the car.
I think a spare is essential, especially when travelling somewhere
unfamiliar. A problem will most likely happen at the most inopportune time,
like a Saturday evening miles from anywhere. Then you have to hope a tyre
dealer has the size you need. I had trouble replacing a cut Bridgestone
Potenza RE 050 A * II 255/40/17 Y.
I hope not, I hate them. I do not think that they give a good ride nor feel.
They are noisier, heavier and 'tram-line' more, mostly unrepairable and
expensive, and environmentally worse than standard tyres.
They take more energy to accelerate and brake due to their increased weight.
They use more oil to be manufactured, and if so often unrepairable after a
puncture, a shorter life too.
Five BMW sales managers have told me that 'run-flats' have saved them from a
serious crash by not blowing out following a deflation. I wonder.
No-one else has told me that they have had a blow-out. I'm sure some have
though, but considering the number of miles travelled by so many millions of
drivers around the world, is it so prevalent ?
Last weekend, I was on rt. 95 driving about 75 mph on the righthand lane,
when a guy passed me on the left. Driving on a doughnut spare.
Pretty much every major tire failure I have had was something that resulted
in major sidewall damage. Driving over the piece of steel rebar sticking
six inches out of the Woodrow Wilson Bridge. Driving over a pothole in
Atlanta that was "fixed" by putting a piece of 1" sheet steel on top. And
once a really dramatic failure due to dry rot.
None of the actual tire failures I have had would have been dealt with by
"C'est un Nagra. C'est suisse, et tres, tres precis."
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