What is the sidewall thickness of BMW run-flat tires?
2 Answers
BMW run-flat tires have a sidewall thickness of 12mm. Precautions for using run-flat tires: Generally, run-flat tires can still be driven at 80KM/h for 250 kilometers after a puncture (specific values are subject to the car manufacturer's regulations), which can prevent car owners from being stranded on some remote roads. However, it should be noted that when the tire damage is severe or the road conditions are poor, the driving distance may be reduced to tens of kilometers. Safety: Run-flat tires have high safety, but they reduce driving comfort, increase fuel consumption, and decrease power. However, in the face of safety, these are minor issues. The safety of run-flat tires is the primary reason why many car owners choose them.
I usually work on tire R&D. The sidewall thickness of run-flat tires is not fixed, generally ranging between 6-10 mm, depending on the BMW model and tire brands like Bridgestone or Michelin. This thickness design incorporates specially reinforced layers that can support the car for about 80 kilometers at zero pressure, avoiding breakdowns on the road. However, it's stiffer than regular tires, affecting comfort, so BMW equips them with softer suspension systems to compensate. I recommend owners check the markings on the tire sidewall or the user manual, as the numbers will clearly indicate the thickness, which may vary for different model years like the 3 Series and 5 Series. In daily maintenance, regularly check tire pressure, as both high and low pressure can easily wear the sidewalls and shorten the tire's lifespan.