BMW 5 Series: Tire pressures
Optimum adjustment of tire pressure is necessary for the following reasons:
- Best possible driving dynamics.
- Maximum utilization of tire service life.
- Reduction of the fuel consumption.
- Optimum operation of various suspension control systems.
For this, the physical principles should be observed in combination with pressure and temperature.
The following rule of thumb applies: So a temperature change for every +/- 10 ºC or +/- 18 ºF relates to an increase or decrease in tire pressure of roughly +/- 0.1 bar or 1.4 psi. Please refer to the temperature chart below.
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Temperature chart
The tire pressures specified by the manufacturer apply for summer and winter operation, irrespective of the temperature. However, it must be observed that due to the seasonal temperature differences, the tire pressures should be checked frequently.
Cold Tire pressure
If the tire air temperature is the same as the current ambient temperature, this is referred to as cold tire pressure. The tire pressures should only be changed with a cold tire pressure on vehicles without the electronic tire pressure label.
Warm Tire pressure
During longer trips at higher driving speeds the tire warms up due to the friction with the road surface.
The temperature of the tire increases as a result and this is accompanied by an increase in tire pressure.
If there is a significant difference between ambient temperature and tire air temperature this is always referred to as warm tire pressure. Avoid changing the tire pressures when the tire is warm on vehicles without the electronic tire pressure label.
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Electronic tire pressure label
Technical functional description
An electronic tire pressure label is being used for the first time at BMW.
The tire pressure label sticker
has been supplemented in the G30 by an additional user menu
System overview
The electronic tire pressure label is an extension to the vehicle software.
No additional components
are required for the integration of this new function. All the information is
supplied by sensors
Tire selection: special sizes
Special sizes (special approval) which are not listed in the menu must be
entered by selecting "Other
tires".
Entering tire special sizes in the electronic tire pressures label on the G30
Special
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Operation
The collision warning and pedestrian warning are switched on and off using
the Intelligent Safety
button.
G30 Intelligent Safety button
Intelligent Safety button
The point at which the early collision warning is issued can be configured in
the "Intelligent Safety
systems" menu on the Central I
Front axle
Double-wishbone front axle in the G30
Support bearing
Wishbone, lower
Steering box
Cross member
Universal joint of steering shaft to steering gear
Cast side section
Strut
Service opening
Rear stiffening label
Steering shaft
Universal joint of steering shaft to steering column
Triangle
