Designation Maximum speed
Q up to 100 mph/160 km/h
R: up to 106 mph/170 km/h
S up to 112 mph/180 km/h
T up to 118 mph/190 km/h
H up to 131 mph/210 km/h
V up to 150 mph/240 km/h
W up to 167 mph/270 km/h
Y up to 186 mph/300 km/h
Tire Identification Number
DOT-Code: DOT xxxx xxx 2120
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
2120: tire age
Tires with DOT codes meet the guidelines of the
U.S. Department of Transportation.
Regardless of the tire tread, replace tires at least
every 6 years.
You can find the manufacture date of the tire on
the tire's sidewall.
Designation Manufacture date
DOT … 2120 21st week 2020
Uniform Tire Quality Grading
Quality grades can be found where applicable on
the tire sidewall between tread shoulder and
maximum section width.
E.g.: Treadwear 200; Traction AA; Temperature
DOT Quality Grades
Traction AA A B C
Temperature A B C
All passenger vehicle tires must conform to Fed‐
eral Safety Requirements in addition to these
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified gov‐
ernment test course. E.g., a tire graded 150
would wear one and one-half, 1 g, times as well
on the government course as a tire graded 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.
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 surfa‐
ces of asphalt and concrete. A tire marked C may
have poor traction performance.
The traction grade assigned to this tire is based
on straight-ahead braking traction tests, and
does not include acceleration, cornering, hydro‐
planing, or peak traction characteristics.
The temperature grades are A, the highest, B,
and C, representing the tire's resistance to the
generation of heat and its ability to dissipate heat
when tested under controlled conditions on a
specified indoor laboratory test wheel. Sustained
Wheels and tires
Online Edition for Part no. 01405A10E93 - VI/20