The correct 255/70R22.5 tire pressure is determined by actual axle load, single or dual fitment and the exact manufacturer table. A common 16PR specification is 140/137M, but 120 psi is its maximum-load endpoint—not the automatic setting for every truck, bus or trailer.
255/70R22.5 load and inflation table
| Cold pressure | Single kg/tire | Single axle kg | Dual kg/tire | Dual axle kg |
|---|---|---|---|---|
| 80 psi | 1,900 | 3,800 | 1,800 | 7,200 |
| 85 psi | 1,980 | 3,960 | 1,860 | 7,440 |
| 90 psi | 2,060 | 4,120 | 1,940 | 7,760 |
| 95 psi | 2,120 | 4,240 | 2,000 | 8,000 |
| 100 psi | 2,220 | 4,440 | 2,020 | 8,080 |
| 105 psi | 2,300 | 4,600 | 2,090 | 8,360 |
| 110 psi | 2,360 | 4,720 | 2,120 | 8,480 |
| 115 psi | 2,450 | 4,900 | 2,230 | 8,920 |
| 120 psi | 2,500 (H) | 5,000 | 2,300 (H) | 9,200 |
These Continental values correspond to the common 140/137 load-index endpoint: index 140 is 2,500 kg for single fitment and index 137 is 2,300 kg per tire in dual fitment. Hankook also publishes 255/70R22.5 140/137M products with the same maximum loads at 120 psi.
Suggested image: 255/70R22.5 140/137M sidewall and 7.50-inch rim.
Alt text: 255/70R22.5 tire pressure and 140/137M marking
Axle-load examples
For a single-fitment axle weighing 4,500 kg, each tire carries 2,250 kg if balanced. The 100 psi row supports 2,220 kg and is insufficient; the 105 psi row supports 2,300 kg. Therefore 105 psi is the first published row supporting the measured load before any approved reserve.
For a dual axle weighing 8,600 kg, nominal load is 2,150 kg per tire. The 110 psi dual row supports 2,120 kg and is insufficient; the 115 psi row supports 2,230 kg. Use the dual column, not the higher single rating.
Application and rim details still matter
Hankook lists this size in all-position, drive and trailer products, including AH37, DH52 and TH31 examples. The same nominal size does not make the tread patterns interchangeable. Axle position, duty cycle, speed approval, tread depth and casing design remain product-specific.
Verified 255/70R22.5 products commonly use a 7.50-inch measuring rim, but the approved wheel list must be checked for the exact tire. The wheel and valve must safely support the selected pressure and load.
How to choose the cold setting
- Weigh the normally loaded vehicle by axle or wheel position.
- Confirm single or dual fitment and read the full 140/137M or other service description using the sidewall guide.
- Use the current table for that exact tire product.
- Select a published row supporting at least the measured load; do not interpolate.
- Respect the lowest tire, rim, valve, axle or vehicle limit.
Check pressure cold and never bleed a hot tire to its cold target. Match dual tires for specification, remaining diameter and pressure. A documented fleet pressure-management process reduces missed inner-dual leaks and load mismatches.
Suggested image: all-position, drive and trailer 255/70R22.5 comparison.
Alt text: 255/70R22.5 truck bus and trailer tire applications
Technical caveats
- 120 psi is the maximum-load endpoint, not the default for every axle.
- Use load index 137 and the dual column for paired tires.
- Do not assume AH37, DH52 and TH31 share identical application approval.
- Axle averages can conceal side-to-side imbalance.
- No intermediate PSI has been inferred.
Frequently asked questions
There is no universal PSI. Use measured axle load and the manufacturer table for the exact tire, fitment and service description.
It is the published maximum-load endpoint for common 140/137M products, but lower loads may be supported by a lower published cold-pressure row.
Index 140 corresponds to 2,500 kg single and index 137 to 2,300 kg per tire in dual fitment at the cited 120 psi endpoint.
Some products, such as verified trailer patterns, are offered in this size. Use only a tire approved for the intended axle position and application.
Divide a balanced axle load by four and use the exact product’s dual column. Select a published cold-pressure row supporting at least that per-tire load.
