Continental tires-I have had failures of 3 tires on a new car, a Mercedes E350 4matic, equipped with Continental 245/40/18 tires. Two tires had weak sidewall and blew out after hitting potholes at low speeds. The last had a bubble in the sidewall.

- Scarsdale, NY, USA

Pirelli scorpion zero tires. With less than 8,000 miles on the tires, I rolled over a one inch stone while driving 30 mph and the tire immediately lost air pressure. If this would have happened at high speed I would have lost control of the vehicle. The company's position is that the tire is safe, even though the stone penetrated through the full tread into the tire cavity. Asimmetrico mo 235/45 R20 100H mo 5570 extra load dot xt pf J884 4408 interno innen radial M+S tubeless R740401 P.14580.459/01 1414 made in germany tread 2 rayon, 2 steel, 2 nylon sidewall 2 rayon E4 0224435-S 0240460 tt 012 X29 (inside tire cavity).

- Gaithersburg, MD, USA