What is the tire pressure for BMW run-flat tires in summer?

[DeJude]

For BMW run-flat tires in summer, the tire pressure is 2.0 bar for the front wheels and 2.4 bar for the rear wheels when unloaded. When fully loaded, it is 2.4 bar for the front wheels and 2.9 bar for the rear wheels. Run-flat tires consist of an outer tire, a standard inner tube, a spare inner tube, a steel rim, a gas generator (or air chamber), a pressure sensor, and a control unit. Normal summer tire pressure standards: Generally, the lower limit of the standard tire pressure for car tires is sufficient. For example, the lower limit for standard tires is 2.4 bar. If the car is often parked outdoors, the tire pressure can usually be about 0.1 bar lower than the standard to prevent tire blowouts due to high temperatures. Hazards of excessive tire pressure: Reduced tire friction and adhesion, affecting braking performance; Causes steering wheel vibration and deviation, reducing driving comfort; Accelerates wear on the central tread pattern, shortening tire lifespan; Increases body vibration, indirectly affecting the lifespan of other components; Causes excessive stretching and deformation of tire cords, reducing tire elasticity and increasing the load on the car during driving; Reduces puncture resistance. When encountering sharp objects like nails or glass on the road, they can easily penetrate the tire, causing internal cracks or blowouts. Normal winter tire pressure standards: In winter, the tire pressure should follow the standard tire pressure for car tires, with an appropriate increase of about 0.2 bar.

[DiLila]

I've been a loyal BMW fan for years and have plenty of experience with run-flat tire pressure in summer. Specifically, the standard tire pressure for BMW's run-flat tires typically ranges between 2.2 and 2.4 bar, and it's best to set it around 2.2 in summer. Why lower in summer? Because as temperatures rise, the air inside the tires expands, making it easier for the pressure to exceed limits. Going over 2.5 bar increases risks and affects driving safety. From the owner's manual, I know the label on my car door indicates 2.3 bar for front tires and 2.4 bar for rear tires, but in summer I start with 2.2 or 2.3. The advantage of run-flat tires is they can still drive dozens of kilometers after a puncture, but incorrect pressure will still wear them out. I check with a gauge every month, especially before trips in hot weather. Remember to measure when tires are cold—either before driving or after parking for several hours—otherwise the readings won't be accurate. Proper tire pressure ensures smoother rides, better fuel efficiency, and tire protection.

[RosalieDella]

As a young person who often goes camping in a BMW, I pay close attention to tire pressure. For run-flat tires, it's best to maintain a pressure of 2.2-2.4 bar in summer. Specifically, my car's standard is 2.4, but I usually set it to 2.3 in summer. When the weather gets hot, tire temperature rises, and the pressure increases accordingly. Too high pressure can lead to blowouts or uncomfortable driving. Last summer, when I went to the beach, I lowered the tire pressure a bit and felt a smoother ride. Run-flat tires are designed to be robust, allowing you to drive even when they're leaking, but insufficient pressure can still cause issues, such as poorer handling. I make it a habit to check with a portable tire pressure gauge before long trips—it's simple and reliable. The values recommended in the BMW manual are a good reference, but in summer, you need to be flexible and not exceed the upper limit. Keeping it above 2.2 bar helps avoid premature tire wear and can even save some fuel costs. When temperatures are high, I check the tire pressure weekly to ensure safety.

[Arthur]

I've been maintaining cars for years, and the summer tire pressure for BMW run-flat tires is quite straightforward. Generally, set it between 2.2 to 2.4 bar, and in summer, keep it slightly lower, around 2.3. Tires expand quickly in hot weather, so excessive pressure isn't safe. I recommend referring to the value on the door sticker and then reducing it by 0.1-0.2. Remember to measure the tire pressure when cold, such as a few hours after parking. Too low pressure increases fuel consumption and damages the tires, so moderate is best. Run-flat tires make emergencies safer, but don't take them for granted.