FORD 2001 Focus - Manual (Page 220)

Maintenance and care
220
Treadwear
The treadwear grade is a
comparative rating based on the
wear rate of the tire when tested
under controlled conditions on a
specified government test course.
For example, a tire grade 150 would
wear one and oneĆhalf (1 1/2) times
as well on the government course
as a tire grade 100. The relative
performance of tires depends upon
the actual conditions of their use,
however, and may depart
significantly from the norm due to
variations in driving habits, service
practices, and differences in road
characteristics and climate.
Traction AA A B C
The traction grades, from highest to
lowest are AA, A, B, and C. Those
grades represent the tire's ability to
stop on wet pavement as measured
under controlled conditions on
specified government test surfaces
of asphalt and concrete. A tire
marked C may have poor traction
performance.
The traction grade assigned
to this tire is based on
straightĆahead braking traction
tests, and does not include
acceleration, cornering,
hydroplaning, or peak traction
characteristics.