See also:

Load index
In addition to the load bearing index, the load index may also be imprinted on the sidewall of the tire. This specifies the load bearing capacity more precisely. ...

Tire pressure of at least 180 kPa (1.8 bar/26 psi) is not reached
If, after five minutes, a pressure of 180 kPa (1.8 bar/26 psi) has not been achieved: – Switch off the tire inflation compressor. – Unscrew the filler hose from the valve of the faulty tire. – ...

Underinflated tires
WARNING Follow recommended tire inflation pressures. Do not underinflate tires. Underinflated tires wear excessively and/or unevenly, adversely affect handling and fuel economy, and are more ...