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Wheels and Tires
7 Speed rating. When stated, indicates the maximum speed (in mph) at which the tire can be used for extended
periods. Q=99 mph (160 km/h), R=106 mph (170 km/h), S=112 mph (180 km/h), T=118 mph (190 km/h),
U=124 mph (200 km/h), H=130 mph (210 km/h), V=149 mph (240 km/h), W=168 mph (270 km/h), Y=186 mph
(300 km/h), (Y)=vehicle's top speed (exceeds the "Y" rating).
8 Tire composition and materials. The number of plies in both the tread area and the sidewall area indicates how
many layers of rubber coated material make up the structure of the tire. Information is also provided on the
type of materials used.
9 Maximum tire load. The maximum load which can be carried by the tire.
10 Maximum permissible inflation pressure. This pressure should not be used for normal driving.
11 U.S. DOT Tire Identification Number (TIN). Begins with the letters DOT and indicates that the tire meets all
federal standards. The next 2 digits/letters represent the plant code where it was manufactured, and the last 4
digits represent the week and year of manufacture. For example, the number 1712 is used to represent the 17th
week of 2012. The other numbers are marketing codes used at the manufacturer's discretion. This information
can be used to contact consumers if a tire defect requires a recall.
12 Treadwear grade. This number indicates the tire's wear rate. The higher the treadwear number is, the longer it
should take for the tread to wear down. A tire rated at 400, for example, lasts twice as long as a tire rated at
200.
13 Traction grade. Indicates a tire's ability to stop on wet roads. A higher graded tire should allow you to stop your
vehicle in a shorter distance than a tire with a lower grade. Traction is graded from highest to lowest as AA, A,
B, and C.
14 Temperature grade. The tire's resistance to heat is grade A, B, or C, with A indicating the greatest resistance.
This grading is provided for a correctly inflated tire, which is being used within its speed and loading limits.
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MODEL X Owner's Manual
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