I. What is the Normal Tire Pressure Range for Run-flat Tires?
When using run-flat tires, it’s crucial to control the tire pressure. While run-flat tires can still be driven with zero pressure, this will cause further damage. Driving long distances with zero pressure can lead to rim deformation and tire failure. Therefore, run-flat tires also need to be maintained at a proper tire pressure. So, what is the normal tire pressure for run-flat tires?
Generally, the tire pressure for run-flat tires is the same as for regular tires, based on the manufacturer’s recommended value, approximately 2.2-2.5 bar. It should not exceed 70-80% of the maximum tire pressure. However, it’s important to note that run-flat tire pressure is not fixed and is affected by the season. For example, in winter, it should be increased by about 0.2 bar, while in summer, it can be decreased by about 0.1 bar, especially when the vehicle is parked outdoors in summer.
II. Can You Drive with Run-flat Tires Despite Abnormal Tire Pressure?
Many car models are equipped with tire pressure monitoring systems (TPMS). Vehicles using run-flat tires especially need TPMS because the impact of a run-flat tire blowout is relatively small and may be difficult to detect. Checking the tire pressure is crucial for diagnosis. So, can you drive with run-flat tires despite abnormal tire pressure?
Generally, it is possible to drive with run-flat tires despite abnormal tire pressure, even if the tire pressure drops to 0. However, driving with abnormal tire pressure is not recommended, primarily to avoid safety accidents:
Low tire pressure increases the contact area between the tire and the ground, increasing friction and driving resistance, leading to higher fuel consumption. It also accelerates wear on run-flat tires, shortening their lifespan. Furthermore, low tire pressure can cause abnormal increases in tire internal temperature during driving. After high-speed or prolonged driving, this can cause rubber fatigue, reduced elasticity, and ultimately, a blowout.
High tire pressure reduces the contact area between the tire and the ground, drastically increasing the pressure and wear per unit area. This can easily lead to loss of braking control. Encountering road bumps or depressions can cause the tire to burst, damaging the vehicle’s suspension system. 3. Inconsistent tire pressure across the four tires can lead to abnormal tire wear. It is generally recommended that all four run-flat tires have the same pressure, at least the two front tires and the two rear tires.