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Old 11-12-2012, 01:10 PM
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mr_clueless mr_clueless is online now
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Location: California
Join Date: Nov 2009
Posts: 3,287
Mein Auto: 2015 328i M-Sport
Thanks for sharing your story.

Originally Posted by SD Z4MR View Post
A full-size spare would have been the only way that our trip could have continued uninterrupted. But our car has a staggered setup with 225/40ZR18 tires in the front. So what size should the spare be? If it were the 255/35ZR18 rear size then having a flat front tire would result in having a mismatched front set. If the spare were the 225/40ZR18 front size, then having a flat rear tire would result in a mismatched rear set. Bottom line, there were no other alternatives that would have resulted in a better outcome.
Indeed in your situation that seems to be the case. For me at least, that would be a deterrent enough to not buy a car with a staggered setup for use on long trips. (Of course, the lack of a full-size spare means there's no benefit anyway.)

Now, about the run-flat tire itself and the screw that caused it to go flat. From the time that we exited the Autobahn until we got the warning was less than a kilometer. We drove less than two kilometers to Auto Orth, only to find it closed, then less than a kilometer to the hotel and less than a kilometer back to Auto Orth on Monday morning. Take a good look at the screw in the tire (the pictures don't do it justice, the head of the screw had been ground completely flat). Do you think that the screw would have been that damaged with only a few kilometers on it, in other words, did we pick up that screw after exiting the Autobahn or did we pick up the screw on the Autobahn or before we got on the Autobahn? Prior to the exit we had been driving for several hours at speeds of 110-120 MPH (not KPH!) and had a brief run at 145 MPH. When my wife saw the screw in the tire she said she sure hoped that we had picked up that screw after we got off the Autobahn. My reaction was the opposite, I said that I hoped that we had picked it up and driven on the Autobahn like that, because that would be a huge testament to the safety of run flat tires.
The only thing that really matters is how things performed after the time that the TPM came on because that is when the tire pressure dropped. So even if you had the nail before getting on the Autobahn, as long as it didn't result in a drop in pressure, not sure that it matters. Or is it that run-flats are more resistant to getting punctured than regular tires?

2015 328i / M Sport / Alpine White / Coral Red / 4 DR / 6 MT / Rear Camera + PDC / Xenons / DHP / 60K+ Miles / Bought 10-30-2014

Last edited by mr_clueless; 11-12-2012 at 01:16 PM.
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