About Your Vehicles Tires

MDH Motors Does Not Sell Tires – We Help You To Maintain Vehicle Safety by Education and Vehicle Maintenance

This grading system, known as the Uniform Tire Quality Grading System (UTQGS), allows consumers to compare tire tread wear, traction performance, and temperature resistance. The federal government requires tire manufacturers to grade their tires in these three areas and place the information on the sidewall of the tire. The UTQG is not a safety rating and not a guarantee that a tire will last for a prescribed number of miles.

Treadwear – Tire Ratings

Treadwear grades are an indication of a tires relative wear rate. The higher the treadwear number is, the longer it should take for the tread to wear down. A control tire is assigned a grade of 100. Other tires are compared to the control tire. For example, a tire grade of 200 should wear twice as long as the control tire.

Of current tires:

  • 15% are rated below 200
  • 25% are rated 201 – 300
  • 32% are rated 301 – 400
  • 20% are rated 401 – 500
  • 6% are rated 501 – 600
  • 2% are rated above 600

Temperature – Tire Ratings

Temperature tire ratings represent a tire’s resistance to heat and its ability to dissipate heat when tested under controlled laboratory test conditions. The grades from highest to lowest are “A”,”B” and “C”. The grade “C” corresponds to the minimum performance required by federal safety standard. Therefore, the “A” tire is the coolest running, and even though the “C” tire runs hotter it does not mean it is unsafe. The temperature grade is established for a tire that is properly inflated and not overloaded.

Traction – Tire Ratings

Traction grades are an indication of a tires ability to stop on wet pavement. A higher graded tire should allow a car to stop on wet roads in a shorter distance than a tire with a lower grade. Traction is graded from highest to lowest as “AA”, “A”, “B”, and “C”.
Of current tires:

  • 3% are rated “AA”
  • 75% are rated “A”
  • 22% are rated “B”
  • only 1 line of tires rated “C”

This post was written by: Martin Hand

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Martin Hand

About Martin Hand

ASE Certified L1 Advanced Mastertech. Martin Hand has over 15 years experience in Asian and European Import Auto Repair. Specializing in electrical diagnosis, engine performance, AT/MT transmission repair/rebuild. Martin is also pursuing a degree in Computers Science & Information Systems starting at Portland Community College while he plans to transfer to OIT. Certified in Java application level programming, experienced with other languages such as PHP, Ruby, JavaScript and Swift. Martin has future plans of automotive diagnostic software development.

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