Tire Service Description Comparator
Compare the load and speed code of two tires. Use the calculator below. Results update as you type.
How the Tire Service Description Comparator Works
This comparator works by decoding the load index and speed rating of 2 or more service descriptions and comparing them side by side. A service description is the code after the size, such as 94W or 121/118S.
- Enter the current service description, for example 98H.
- Enter the replacement, for example 102T.
- Read the loads: 750 kg vs 850 kg (1,653 lb vs 1,874 lb).
- Read the speeds: 210 km/h vs 190 km/h (130 mph vs 118 mph).
The Formula
The formula decodes each part separately: Load = LI_Table[Index] and Speed = SR_Table[Letter].
Load (kg) = LI_Table[Index] Speed (km/h) = SR_Table[Letter] Set Load (kg) = 4 × Load Pass = Load_new ≥ Load_placard AND Speed_new ≥ Speed_placardWorked example: 116T carries 1,250 kg (2,756 lb) per tire at up to 190 km/h (118 mph). A set of 4 carries 5,000 kg.
Conversion Table
The conversion table decodes 10 service descriptions from 91V to 126/123Q. Each row lists load per tire, speed and the load of a 4-tire set.
LT descriptions show 2 load indexes. The first is for single use, and the second is for dual-wheel use on one hub.
| Service Description | Load per Tire (kg / lb) | Speed (km/h / mph) | Load for 4 Tires (kg) |
|---|---|---|---|
| 91V | 615 / 1,356 | 240 / 149 | 2,460 |
| 94W | 670 / 1,477 | 270 / 168 | 2,680 |
| 98H | 750 / 1,653 | 210 / 130 | 3,000 |
| 102T | 850 / 1,874 | 190 / 118 | 3,400 |
| 107H | 975 / 2,150 | 210 / 130 | 3,900 |
| 112S | 1,120 / 2,469 | 180 / 112 | 4,480 |
| 116T | 1,250 / 2,756 | 190 / 118 | 5,000 |
| 121/118S | 1,450 / 3,197 | 180 / 112 | 5,800 |
| 123/120R | 1,550 / 3,417 | 170 / 106 | 6,200 |
| 126/123Q | 1,700 / 3,748 | 160 / 99 | 6,800 |
What Is the Tire Service Description Comparator?
The Tire Service Description Comparator is a tool that compares tire load and speed specifications in one step. It answers whether a replacement tire meets or beats the original on both counts.
A tire can win on load and lose on speed, or the reverse. The comparator shows both results together, so neither gets missed.
Common Uses
This comparator has 4 uses: replacement approval, all-terrain swaps, winter swaps and fleet standards.
- Approve replacements: Check both ratings at once.
- Swap to all-terrains: See the speed rating trade-off.
- Swap to winters: Confirm load matches the summer tire.
- Set fleet standards: Define a minimum service description.