Underinflated or overinflated tires
See also:
Tread wear
The tread wear grade is a comparative rating based on the wear rate of the tire
when tested under controlled conditions on a specified U.S. government course. For
example, a tire graded 150 would ...
Maximum tire pressure
WARNING
Never exceed the maximum tire inflation
pressure. Follow recommended tire inflation
pressures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly, ...
Removing the ball coupling
Observe the manufacturer's installation instructions.
Press the protective cap into the ball coupling recess.
Make sure that the protective cap is firmly in place.
...
