N ormally, the only markings you see on your tire's sidewall are letters and numbers. There's the SSR label that means the tire can run flat for a limited distance, 225/45R18 that points to your ...

The run-flat tire is actually a more than 30-year old concept, but the technology can be traced back to 1892, when the first patent was officially registered.

Run-flat tires are expensive; a replacement P-Zero costs over $420 with labor and taxes. In my case, the repair cost was not covered by BMW, and while Pirelli has its own warranty, it's conditional.

Our grandparents would agree that they're a modern miracle: tires that keep on turning even when they're flat. But how exactly does a run flat tire work?

Bridgestone is a leader in run-flat tire technology. Porsche chose the company in the mid-1980s to develop a special run-flat for its 200-mph 959 supercar, and they have been innovating ever since.

This new replacement all-season tire can add run-flat protection to cars. Published: September 24, 2014 05:30 PM. Find Ratings Tires. A ...

Run-flat tyres represent a major step forward in road safety technology but like all innovations, they require responsible usage and regular maintenance. “Safety starts with knowledge.

There's the SSR label that means the tire can run flat for a limited distance, ... M+S and 3PMSF. Both symbols do tell you that a tire is winter-ready, but they don't exactly mean the same thing.