540
Uniform tire quality grading standards
Example 2B
For example, if a person weighing 143 lbs( 65 kg) and a child weighing 40 lbs( 18 kg) now enter the same vehicle( bringing the number of occupants to three), and a child restraint system weighing 11 lbs( 5 kg) is installed in the vehicle for the child to use, the calculations are as follows.
1. Calculate the total weight.
2. Calculate the available load capacity.
3. The total weight now exceeds the capacity weight by 32 lbs( 15 kg), so the cargo weight must be reduced by 32 lbs( 15 kg) or more.
13-4. Uniform tire quality grading standards
S13AC
This information indicates the relative performance of passenger car tires in the area of treadwear, traction, and temperature resistance. This is to aid the consumer in making an informed choice in the purchase of tires.
Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width.
For example:
TREADWEAR 200 TRACTION AA TEMPERATURE A
The quality grades apply to new pneumatic tires for use on passenger cars. However, they do not apply to deep tread, winter type snow tires, space-saver or temporary use spare tires, tires with nominal rim diameters of 12 inches or less, or to some limited production tires.