Single vs Dual Load Comparator
Compare axle capacity with single vs dual tire fitment. Use the two load indexes on LT tires to see capacity per axle in kg and lb.
Compare application-specific load ratings.
Single vs Dual Load Comparator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Single vs Dual Load Comparator Works?
The Single vs Dual Load Comparator works by multiplying the single load by 2 tires and the dual load by 4 tires to compare axle capacity in each fitment. The tool uses 3 steps.
Enter the dual index
Type the marking, for example LT245/75R17 121/118S.
Compute single axle
The comparator multiplies 1,450 kg by 2 for 2,900 kg (6,393 lb) with single wheels.
Compute dual axle
The comparator multiplies 1,320 kg by 4 for 5,280 kg (11,640 lb) with dual wheels.
Single vs Dual Load Comparator Formula
The Single vs Dual Load Comparator formulas are C_single = 2 × L(i_s) and C_dual = 4 × L(i_d) for one axle.
C_s = 2 × L(i_s)C_d = 4 × L(i_d)k = L(i_d) ÷ L(i_s)- i_s, i_d
- Single and dual load index
- k
- Share of single capacity kept in dual service
Worked example
An LT235/85R16 120/116R tire gives 2,800 kg (6,173 lb) on a single-wheel axle and 5,000 kg (11,023 lb) on a dual-wheel axle. Each tire keeps 89.3% of its single capacity in dual service.
Single vs Dual Load Comparator Conversion Table
The Single vs Dual Load Comparator conversion table compares single and dual axle capacity for 6 LT sizes.
| Size | Index | Single axle (2 tires) | Dual axle (4 tires) | Dual share per tire |
|---|---|---|---|---|
| LT215/85R16 | 115/112 | 2,430 kg (5,357 lb) | 4,480 kg (9,877 lb) | 92.2% |
| LT225/75R16 | 115/112 | 2,430 kg (5,357 lb) | 4,480 kg (9,877 lb) | 92.2% |
| LT235/85R16 | 120/116 | 2,800 kg (6,173 lb) | 5,000 kg (11,023 lb) | 89.3% |
| LT245/75R17 | 121/118 | 2,900 kg (6,393 lb) | 5,280 kg (11,640 lb) | 91.0% |
| LT265/70R17 | 121/118 | 2,900 kg (6,393 lb) | 5,280 kg (11,640 lb) | 91.0% |
| LT275/65R18 | 123/120 | 3,100 kg (6,834 lb) | 5,600 kg (12,346 lb) | 90.3% |
What is Single vs Dual Load Comparator?
A Single vs Dual Load Comparator is a tool that compares axle capacity when a tire runs in single fitment and in dual fitment. Dual-capable tires carry 2 load indexes, separated by a slash.
The dual index is lower. Crowned roads and uneven pressure make one tire of a dual pair carry more than half of the load.
The comparator suits pickups and vans that come in single-rear-wheel and dual-rear-wheel versions.
What are the uses of Single vs Dual Load Comparator?
There are 4 main uses of the Single vs Dual Load Comparator, including dually conversion and payload planning.
Dually conversion
See the capacity a dual rear axle adds.
Payload planning
Match axle capacity with payload and trailer loads.
Spec sheet checks
Read both indexes on an LT tire correctly.
Fleet choices
Compare single and dual van configurations.
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