PSI (pounds per square inch)
A standard unit of measure for tire pressure.
See also:
Snow chains
For safety reasons, Mercedes-Benz
recommends that you only use snow chains
which have been specially approved for your
vehicle by Mercedes-Benz, or are of a
corresponding standard of quality.
...
Making adjustments in 5 mph (Canada:
10 km/h) increments
Briefly press the cruise control lever
beyond the pressure point, up 1 for a
higher speed or down 2 for a lower speed.
The last speed stored is increased or
reduced. ...
Maximum permissible tire pressure
Maximum permissible tire pressure for one
tire. ...