Single vs Dual Tire Rating Comparator
See the load limit for single and dual tires. Use the calculator below. Results update as you type.
How the Single vs Dual Tire Rating Comparator Works
This comparator works by decoding both numbers of an LT load index pair, such as 121/118, into capacity per tire. The first number is for single mounting and the second for dual mounting.
- Enter the load index pair, for example 121/118.
- Read the single capacity: 1,450 kg (3,197 lb).
- Read the dual capacity per tire: 1,320 kg (2,910 lb).
- Read the capacity of a dual pair: 2,640 kg.
The Formula
The formula is Load = LI_Table[Index] for each number in the pair.
Single Load = LI_Table[First Index] Dual Load per Tire = LI_Table[Second Index] Dual Pair Load = 2 × Dual Load per Tire Dual Axle Load = 4 × Dual Load per TireWorked example: 126/123 gives 1,700 kg single and 1,550 kg dual. A dual axle with 4 tires carries 6,200 kg (13,669 lb).
Conversion Table
The conversion table decodes 10 LT load index pairs from 104/101 to 129/126. Dual ratings sit 3 index points below single ratings.
The dual rating is lower than the single rating. Two tires on one hub do not share load perfectly evenly.
| Index Pair | Single (kg / lb) | Dual per Tire (kg / lb) | Dual Pair (kg) | 4 Dual Tires (kg) |
|---|---|---|---|---|
| 104/101 | 900 / 1,984 | 825 / 1,819 | 1,650 | 3,300 |
| 108/104 | 1,000 / 2,205 | 900 / 1,984 | 1,800 | 3,600 |
| 112/109 | 1,120 / 2,469 | 1,030 / 2,271 | 2,060 | 4,120 |
| 115/112 | 1,215 / 2,679 | 1,120 / 2,469 | 2,240 | 4,480 |
| 118/115 | 1,320 / 2,910 | 1,215 / 2,679 | 2,430 | 4,860 |
| 120/117 | 1,400 / 3,086 | 1,285 / 2,833 | 2,570 | 5,140 |
| 121/118 | 1,450 / 3,197 | 1,320 / 2,910 | 2,640 | 5,280 |
| 123/120 | 1,550 / 3,417 | 1,400 / 3,086 | 2,800 | 5,600 |
| 126/123 | 1,700 / 3,748 | 1,550 / 3,417 | 3,100 | 6,200 |
| 129/126 | 1,850 / 4,079 | 1,700 / 3,748 | 3,400 | 6,800 |
What Is the Single vs Dual Tire Rating Comparator?
The Single vs Dual Tire Rating Comparator is a tool that explains the 2-number load index on light truck tires. Dual-rear-wheel (DRW) pickups, vans and box trucks mount 2 tires side by side on each rear hub.
Each dual tire carries less than its single rating. The comparator shows how much, so you can check axle capacity on dually trucks.
Common Uses
This comparator has 4 uses: dually checks, box-truck checks, upfit planning and replacement checks.
- Check dually trucks: Compute rear axle capacity.
- Check box trucks: Confirm dual capacity for loaded runs.
- Plan upfits: Match tires to added body weight.
- Check replacements: Compare single and dual ratings.