UTQG Temperature Grade Comparator
Compare UTQG temperature grades A, B and C. See the laboratory test speeds behind each grade in mph and km/h.
Compare standardized temperature grades.
UTQG Temperature Grade Comparator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How UTQG Temperature Grade Comparator Works?
The UTQG Temperature Grade Comparator works by translating each temperature letter into the laboratory wheel speed the tire survived for 30 minutes. The tool uses 3 steps.
Enter 2 grades
Type the temperature grade of each tire, for example B and A.
Decode the speeds
The comparator returns 100–115 mph for B and above 115 mph for A.
Compare
The comparator marks the A tire as more resistant to heat build-up at high speed.
UTQG Temperature Grade Comparator Formula
The UTQG Temperature Grade Comparator uses a speed threshold table: A > 115 mph, B = 100–115 mph, C = 85–100 mph on the indoor test wheel.
Grade = A if V_pass > 115 mph ; B if 100–115 ; C if 85–100V_kmh = V_mph × 1.609344- V_pass
- Highest step speed completed in the test
Worked example
A tire graded A passed a 30-minute step above 115 mph (185 km/h). A tire graded C passed 85–100 mph (137–161 km/h), the federal minimum.
UTQG Temperature Grade Comparator Conversion Table
The UTQG Temperature Grade Comparator conversion table lists the 3 temperature grades and their test speeds.
| Grade | Test speed | Note |
|---|---|---|
| A | Above 115 mph (185 km/h) | Highest heat resistance |
| B | 100–115 mph (161–185 km/h) | Middle grade |
| C | 85–100 mph (137–161 km/h) | Federal minimum (FMVSS 109/139) |
What is UTQG Temperature Grade Comparator?
A UTQG Temperature Grade Comparator is a tool that compares the temperature letters on US passenger tires. The grade measures a tire's resistance to heat build-up on a laboratory drum at correct pressure and rated load.
Heat damages rubber and bonding inside the tire. A higher grade shows more margin at sustained high speed.
The grade assumes correct inflation. Underinflation and overload raise heat far above the test conditions.
What are the uses of UTQG Temperature Grade Comparator?
There are 4 main uses of the UTQG Temperature Grade Comparator, including hot climate choices and highway driving.
Hot climate choices
Prefer A grades for desert highway driving.
Highway driving
Pick A grades for long high-speed trips.
Heavy loads
Add heat margin for loaded vehicles.
Label reading
Explain the 3 letters to a buyer.
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