9.5R17.5 tire pressure cannot be selected from tire size alone. This size is sold in distinctly different load configurations, including a conventional 129/127L version and high-capacity 143/141 trailer or severe-duty versions. Their maximum cold pressures and load capacities are not interchangeable.
The correct starting point is the complete sidewall service description, followed by the actual axle load and the load-and-inflation table approved for that exact tire. The values below come from published manufacturer data; no missing PSI values have been estimated.
9.5R17.5 specifications are not all the same
| Manufacturer example | Construction / service description | Single maximum | Dual maximum | Published cold pressure | Typical application |
|---|---|---|---|---|---|
| Westlake MD738A | Load Range G, 14PR, 129/127L | 1,850 kg (4,080 lb) | 1,750 kg (3,860 lb) | 750 kPa (109 psi) | On/off-road drive axle |
| Westlake MD738A | Load Range H, 16PR, 143/141J | 2,725 kg (6,005 lb) | 2,575 kg (5,675 lb) | 875 kPa (128 psi) | High-load on/off-road drive |
| Michelin XTE2 | Load Range J, 143/141J, tubeless | Check exact Michelin table | Check exact Michelin table | 8.5 bar listed for single fitment | Trailer service |
The letter after the load indexes can also represent the speed symbol. In 143/141J, the final J is a speed symbol of 100 km/h; it should not be confused with “Load Range J.” Michelin XTE2 is specifically listed as LRJ and 143/141J, so both meanings appear in the same specification. By comparison, L corresponds to 120 km/h.
129/127 load and inflation reference
Hankook’s 2025 load-and-inflation chart publishes axle capacities at the following cold pressures. “Single axle” means two tires using load index 129. “Dual axle” means four tires using load index 127.
| Cold pressure | 129 single axle | 127 dual axle |
|---|---|---|
| 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) | 3,290 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 |
At 109 psi, those axle capacities equal 1,850 kg per tire in single fitment and 1,750 kg per tire in dual fitment, matching the 129/127 load indexes and the Westlake Load Range G endpoint.
High-capacity 143/141 versions
A 143/141 version is a different tire specification, not a pressure upgrade for a 129/127 casing. Load index 143 corresponds to 2,725 kg per tire in single fitment, while 141 corresponds to 2,575 kg per tire in dual fitment. Manufacturer endpoints vary: Westlake publishes 128 psi for its Load Range H product, while the Hankook general chart continues to 131 psi for the 143/141 reference. Michelin’s XTE2 LRJ is a trailer-focused 143/141J product and lists 8.5 bar for single fitment.
This variation is exactly why a fleet must not write one universal “9.5R17.5 pressure” on its maintenance board. Record the manufacturer, pattern, load range, ply rating, load index, speed symbol and axle position.
9.5R17.5 high-capacity trailer tire mounted on a 6.75-inch rim
Suggested alt text: 9.5R17.5 trailer tire Load Range J
How to choose the correct cold pressure
- Read the complete sidewall: 129/127L and 143/141J require different tables.
- Identify the intended position—steer, drive, all-position or trailer—and confirm that the pattern is approved for it.
- Weigh the vehicle in its normal loaded condition, preferably by individual wheel position.
- Use the heaviest wheel position on each axle and the manufacturer’s single or dual table as applicable.
- Use one cold pressure across tires on the same axle, while respecting tire, rim, wheel, valve and vehicle limits.
Never assume that a 6.75-inch rim is rated for every pressure shown above. The rim and valve must be approved for the required load and inflation. For help interpreting the full service description, use our truck tire sidewall markings guide. Fleets should incorporate these checks into a documented pressure management program.
Technical caveats
- All pressures in this guide are cold inflation pressures.
- Do not bleed hot tires to return them to the cold setting.
- Do not interpolate between missing manufacturer values.
- Never use a high-capacity pressure on a lower-rated casing, rim or valve.
- Maintain matched size, construction, tread depth and pressure in dual assemblies.
- Trailer suitability is product-specific; size and load index alone do not approve a tire for trailer service.
- The legal axle rating and vehicle limits may be lower than the combined tire capacity.
9.5R17.5 tire pressure FAQ
It depends on the exact service description and actual load. Hankook publishes 65–109 psi axle-load values for the 129/127 reference, while high-capacity 143/141 products may use substantially higher manufacturer-specific endpoints.
No. A common Load Range G specification is 14PR 129/127L. Michelin XTE2 LRJ is a high-capacity 143/141J trailer tire. Their pressure and load limits are not interchangeable.
The first load index applies in single fitment and the second in dual fitment. For example, 129/127 represents 1,850 kg single and 1,750 kg dual per tire; 143/141 represents 2,725 kg single and 2,575 kg dual per tire.
No. The final J in 143/141J is the speed symbol, rated at 100 km/h. Load range is a separate specification. Michelin XTE2 is explicitly listed as LRJ, while other 143/141J products may use another load range or ply designation.
Some products are designed for trailer service, including Michelin XTE2 LRJ, but not every 9.5R17.5 tire is trailer-approved. Confirm the exact pattern, service description, rim and manufacturer application guidance.
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