Originally Posted by
Tireguy
As someone in the tire industry for 18 years, I was only looking out for your safety. You don't have to push a tire to its limits for it to fail. Overloading and under inflation is the leading cause of tire failure. Mis-application would be another. I see hundreds of cars with the "stance" look. I'm sure some are on the forums saying they've never had issues.
You never have tire issues until you have your first one. Good luck.
I too assumed that running the 255/30-21 on a 9.5" wheel was fine, everyone was doing it. There was no 265/30-21 tire and 275s were too wide for my offset. Funny thing now is Michelin does not even make a PSS in 255/30-21.
When the first tire blew out, it was not too much of an inconvenience, I was driving and it was fairly easy to put the spare on, I assumed that it was from hitting a pothole or something on the freeway.
Second time it happened my wife was driving and she was out in the middle of nowhere. Roadside assistance came and put the spare on and she had to get a hotel room and wait a couple of days for another tire to get shipped to the tire shop.
The third time it happened it was in the back wheel and I pretty much ruled out hitting a bump in the road (that is three blown tires, plus the photos of the other three I posted that still held air).
I bought a set of Pirelli's instead of the PSS in the same size 255/30-21 ( Michelin had no 255 the 265 were on back order), we decided to trade the S6 in on a different car and took off the 21's, all four of the Pirelli's had the same separation at the bead as the Michelin photos I posted. I tried to get the tires replaced under road hazard warranty and it was denied because of the load rating was too low for the car.
To sum up the math, there was a total of six PSS purchased (three had blowouts while driving, three showed physical signs of failure) and four P-zero (one went flat, after 2 months all four showed physical signs of failure)
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