TIRE DESIGNATION CODES
Key to Tire Designation Codes
Sustained speed rating is designated by a letter code:
N 93 mph (150 km/h)
S 112 mph (180 km/h)
H 130 mph (210 km/h)
V 149 mph (240 km/h)
Z 149+ mph (240+ km/h)
Wheel diameters are usually in inches and tire width in millimeters or a letter
mm letter inches
80 MH 3.00
90 MJ 3.25
100 ML 3.50
110 MM 4.00
120 MP 4.50
130 MT 5.00
140 MU 5.50
150 MV 6.00
The shoulder height is stated as a percentage of the tire width as in the
following tire designation.
Where the 100 is tire width in mm. The 90 means the shoulder height is
90 mm or 90 percent of 100. It is a V speed rated or 149 mph. And fits
a 18 inch wheel.
The tire also contains a D.O.T. number. The last three digits show the
year and week that the tire was manufactured. e.g., a tire stamped
324 means the tire was made in the 32nd week of 1994. Hopefully, it
will not be too difficult to tell the difference in a tire made in 1984
from one made in 1994. Tires suffer from sunlight, ozone, and aging
deterioration. You should choose the newer tire when the opportunity
Source for decoding where the tire was manufactured
Addendum from "Craig" <email@example.com>
The place to see all manufacturing sites for
DOT approved tires is at the following site:
At the top of the page will be a search
box and above that is an alphabet list. Just
select the first letter that follows the DOT stamp
on your tire. My Michelins are HB. Shows to be
made in Spain. (tires in the rain are mainly made
in Spain) (sorry) My old .... Avons are AT and are
of English ilk. Enjoy!
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Maintainer: BungeeBob Durrstein
Last Update: Monday, December 04, 2000