There is no single correct pressure for every 225/75R17.5 commercial tire. The correct cold inflation pressure depends on the tire’s exact service description, actual axle load, single or dual fitment, approved wheel, and the load-and-inflation table published for that tire.
For a common 225/75R17.5 129/127 fitment, Hankook’s published table covers axle loads from 2,455 to 3,700 kg in single configuration and from 4,650 to 7,000 kg in dual configuration at 65–109 PSI. These figures are load capacities, not a universal recommendation for every vehicle.
225/75R17.5 Tire Pressure Quick Answer
Start with a measured axle weight. Match the sidewall’s load index and fitment to the manufacturer’s table, then select a cold pressure that supports at least the measured load. Do not use 105 or 109 PSI simply because those values appear near the top of a chart.
- Single fitment: two tires carry the axle load.
- Dual fitment: four tires carry the axle load, and the dual row must be used.
- Cold pressure: check before driving, before heat raises operating pressure.
- Final authority: the exact tire manufacturer’s current table and the vehicle placard or fleet specification.
225/75R17.5 Load and Inflation Table
The following values are reproduced from Hankook’s 2025 commercial truck tire load-inflation poster for 225/75R17.5, load index 129 single and 127 dual. Loads are shown per axle.
| Cold pressure | Single axle, LI 129 | Dual axle, LI 127 |
|---|---|---|
| 65 PSI / 4.5 bar | 2,455 kg | 4,650 kg |
| 73 PSI / 5.0 bar | 2,675 kg | 5,060 kg |
| 80 PSI / 5.5 bar | 2,885 kg | 5,460 kg |
| 87 PSI / 6.0 bar | 3,095 kg | 5,855 kg |
| 94 PSI / 6.5 bar | 3,295 kg | 6,240 kg |
| 102 PSI / 7.0 bar | 3,500 kg | 6,620 kg |
| 109 PSI / 7.5 bar | 3,700 kg | 7,000 kg |
What 129/127 Means
The service description separates the rating for single and dual use. Load index 129 applies when one tire is fitted at each end of the axle. Load index 127 applies to each tire when two tires are fitted at each end. The lower dual rating accounts for the operating conditions of paired tires.
| Marking | Configuration | Maximum reference load per tire |
|---|---|---|
| 129 | Single | 1,850 kg |
| 127 | Dual | 1,750 kg |
If your sidewall shows a different service description, load range, maximum pressure, or speed symbol, do not apply this table automatically. Use our truck tire sidewall markings guide to identify the complete specification first.
How to Calculate Pressure from Axle Load
Weigh the vehicle in its normal loaded condition. Use the heaviest measured axle-end load when individual wheel-position weights are available. If only the total axle weight is available, compare that number directly with the appropriate single or dual axle row.
Single-fitment example
A measured axle load of 3,000 kg falls above the 2,885 kg capacity at 80 PSI but below the 3,095 kg capacity at 87 PSI. In this Hankook 129 single table, 87 PSI is therefore the first listed cold pressure that supports the measured axle load. Any fleet safety margin must follow the tire maker, vehicle maker, and fleet policy without exceeding component limits.
Dual-fitment example
A measured dual-tire axle load of 6,000 kg is higher than the 5,855 kg capacity at 87 PSI. The next table step, 94 PSI, supports 6,240 kg. Do not divide the load by two and use the single row; the published dual row already represents four tires per axle.
Is 225/75R17.5 a Trailer Tire Size?
225/75R17.5 is used across more than one commercial-vehicle application. Depending on the product, it may be offered for all-position, drive, or trailer service. Tire size alone does not establish the wheel position.
For a trailer, verify that the specific tread line is approved for trailer service, then use the correct single or dual table for the actual axle arrangement. Also confirm speed rating, rim approval, valve capacity, and the wheel’s maximum pressure. A trailer application does not automatically mean “use maximum PSI.”
Why Load Range Cannot Be Assumed from Tire Size
Load Range G, H, J and European ply or service-description markings are not interchangeable labels. A different 17.5-inch product can have a different casing, load index and maximum pressure even when its nominal dimensions look similar. For example, the Load Range G and J alternatives discussed for 215/75R17.5 must not be transferred to a 225/75R17.5 tire unless the exact product databook and sidewall support that designation.
The safe sequence is: read the complete sidewall, identify the manufacturer and pattern, confirm the approved rim, and then open the matching table. For another manufacturer-based reference, see the published Goodyear truck tire pressure chart.
Technical Limits to Check Before Inflation
- Never exceed the maximum pressure or load marked on the tire.
- Never exceed the wheel, rim, valve, or vehicle manufacturer’s limits.
- Use matched tires in dual assemblies and maintain correct dual spacing.
- Do not bleed pressure from a hot tire to restore the cold setting.
- Recheck pressure after repairs, tire changes, seasonal temperature shifts, or a material change in operating load.
A written inspection routine is more reliable than occasional visual checks. Our article on pressure management in truck fleets explains how pressure control fits into preventive maintenance and operating performance.
Manufacturer comparison for 225/75R17.5
The common 129/127M service description is not unique to one brand. Continental lists 225/75R17.5 in its light commercial steer and drive ranges, while Sailun offers the SAR1 regional all-position tire with the same load and speed indexes. Manufacturer pressure data must still be kept separate.
| Manufacturer/product | Service description | Application | Maximum single load | Maximum dual load | Published product pressure |
|---|---|---|---|---|---|
| Continental Hybrid LS3 / LD3 | 129/127M | Steer or drive, pattern dependent | 1,850 kg | 1,750 kg | Use the matching Continental pressure table |
| Sailun SAR1 | 129/127M, 16 PR | Regional all-position | 1,850 kg | 1,750 kg | 125 PSI (725 kPa) |
| Hankook reference used above | 129/127 | Verify exact pattern | 1,850 kg | 1,750 kg | Use the Hankook table above |
Final Recommendation
For a 225/75R17.5 129/127 tire covered by the Hankook table above, select cold pressure from the measured axle load and the correct single or dual row. Do not treat 105 or 109 PSI as a size-wide rule, and do not assume the Load Range G or J values of a neighboring size apply. Confirm the exact tire, wheel and application before setting a fleet standard.
FAQ
There is no single PSI for every 225/75R17.5 tire. Weigh the axle and use the exact tire manufacturer’s single or dual load-and-inflation table. For the Hankook 129/127 reference shown here, the published range is 65–109 PSI.
For the referenced 129/127 specification, 109 PSI corresponds to 1,850 kg per tire in single fitment and 1,750 kg per tire in dual fitment, or 3,700 kg and 7,000 kg per axle respectively.
Load index 129 is the single-tire rating and 127 is the dual-tire rating. They must be matched to the correct configuration and pressure table.
Yes, some 225/75R17.5 products are designed or approved for trailer service, but tire size alone does not confirm the application. Check the exact tread line, service description, speed rating and manufacturer documentation.
No. Do not transfer a pressure table from another size or load designation. Use the load range or service description printed on the exact tire and its matching manufacturer table.
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