The correct 235/75R17.5 tire pressure cannot be selected from tire size alone. This size appears with more than one service description, including 143/141K trailer products and 132/130M truck or all-position products. Their load capacity, speed symbol and usable pressure table are not interchangeable.
Hankook’s product catalog lists the Smart Flex TH31 235/75R17.5 143/141K at a maximum of 127 PSI. A referenced 132/130M product is listed at 110 PSI. The correct starting pressure must be chosen from actual axle load, single or dual fitment, and the exact markings on the tire.
235/75R17.5 Tire Pressure Quick Answer
Read the entire service description before using a pressure table. A marking such as 143/141K combines load indexes with a speed symbol; 132/130M is a different load-and-speed package. Neither 110 nor 127 PSI is automatically correct for every vehicle using this size.
| Example marking | Typical distinction in referenced Hankook data | Top listed pressure |
|---|---|---|
| 143/141K | Higher-capacity specification; available in trailer product lines such as Smart Flex TH31 | 127 PSI product maximum |
| 132/130M | Lower-capacity specification found in truck/all-position product variants | 110 PSI product maximum |
143/141 Is Not a Hankook-Only Rating
143/141 is a standardized pair of load indexes, not a proprietary Hankook feature. Other manufacturers may use the same indexes on tires designed for equivalent loads. What makes a product distinct is the complete combination of size, load indexes, speed symbol, casing, tread design, wheel-position approval and operating application.
- 143 single: 2,725 kg per tire.
- 141 dual: 2,575 kg per tire.
- Maximum axle reference: 5,450 kg with two single-mounted tires or 10,300 kg with four dual-mounted tires.
These are load-index capacities, not instructions to inflate every tire to the maximum listed pressure. If you are unsure how to identify the full marking, review our truck tire sidewall markings guide.
235/75R17.5 143/141 Load and Inflation Table
The following Hankook reference gives capacity per axle. The 143 row applies to single fitment and the 141 row to dual fitment.
| Cold pressure | LI 143 single axle | LI 141 dual axle |
|---|---|---|
| 73 PSI / 5.0 bar | 3,405 kg | 6,435 kg |
| 80 PSI / 5.5 bar | 3,675 kg | 6,945 kg |
| 87 PSI / 6.0 bar | 3,940 kg | 7,445 kg |
| 94 PSI / 6.5 bar | 4,200 kg | 7,935 kg |
| 102 PSI / 7.0 bar | 4,455 kg | 8,420 kg |
| 109 PSI / 7.5 bar | 4,710 kg | 8,900 kg |
| 116 PSI / 8.0 bar | 4,955 kg | 9,370 kg |
| 123 PSI / 8.5 bar | 5,205 kg | 9,835 kg |
The generic poster includes a 131 PSI column, but the TH31 143/141K catalog limit is 127 PSI. Its maximum rated loads are 2,725 kg single and 2,575 kg dual per tire at that product limit. Do not use the 131 PSI column for this tire, and do not interpolate between table steps without manufacturer guidance.
235/75R17.5 132/130 Load and Inflation Table
The 132/130 specification carries less load than 143/141 and therefore requires its own rows. Applying the higher-capacity table to it would overstate how much the tire can support.
| Cold pressure | LI 132 single axle | LI 130 dual axle |
|---|---|---|
| 65 PSI / 4.5 bar | 2,520 kg | 4,795 kg |
| 73 PSI / 5.0 bar | 2,745 kg | 5,215 kg |
| 80 PSI / 5.5 bar | 2,960 kg | 5,630 kg |
| 87 PSI / 6.0 bar | 3,175 kg | 6,035 kg |
| 94 PSI / 6.5 bar | 3,385 kg | 6,435 kg |
| 102 PSI / 7.0 bar | 3,590 kg | 6,825 kg |
| 109 PSI / 7.5 bar | 3,795 kg | 7,215 kg |
Does 143/141 Change the Speed Rating?
No. Load index and speed symbol describe different limits. The numbers 143/141 identify load capacity; the following letter identifies the approved maximum speed under specified service conditions.
| Speed symbol | Nominal maximum speed |
|---|---|
| J | 100 km/h |
| K | 110 km/h |
| L | 120 km/h |
| M | 130 km/h |
Therefore, 143/141J and 143/141K share the same nominal load indexes but not the same speed symbol. Hankook documentation has included 235/75R17.5 trailer products with 143/141J, while a current Smart Flex TH31 listing shows 143/141K. Use the letter on the fitted tire and the documentation for that exact product; never upgrade J to K by assumption.
Trailer Application: What to Verify
235/75R17.5 is available in dedicated trailer lines, including Hankook Smart Flex TH31. That does not make every tire of this size a trailer tire. Confirm the product name, wheel-position approval and complete service description.
- Confirm whether the tire is approved for trailer, steer, drive or all-position service.
- Use the dual row only when four tires actually support the axle.
- Check approved rim width, dual spacing, valve rating and wheel pressure limit.
- Account for the product’s speed symbol and the vehicle’s real duty cycle.
- Do not select pressure from the tire’s maximum load unless the measured load requires it.
How to Select Cold Pressure from Axle Weight
Weigh the normally loaded vehicle. Identify whether the axle uses single or dual tires, then choose the row matching the complete tire marking. Select the first pressure step capable of supporting at least the measured axle load, subject to the tire and component limits.
For example, a 143 single axle weighing 4,500 kg exceeds the 4,455 kg capacity at 102 PSI. The next listed step, 109 PSI, supports 4,710 kg. By contrast, a 132 single axle at the same weight is beyond the maximum capacity shown for that specification; adding pressure does not turn a lower-load tire into a 143 tire.
For a broader manufacturer reference, consult the published Goodyear truck tire pressure chart. Fleet operators should also use a repeatable inspection and recording process, as described in our guide to pressure management in truck fleets.
Technical Caveats
- All pressures in this guide are cold inflation references.
- Never bleed a hot tire down to its cold target.
- Never exceed the lowest limit among the tire, rim, wheel, valve and vehicle.
- Matched dual tires must have compatible dimensions, condition and pressure.
- Reweigh after a material change in cargo, body equipment or axle distribution.
Continental and Sailun 235/75R17.5 variants
Continental confirms the conventional 132/130M truck specification in steer and drive patterns. Sailun product data confirms both the conventional truck rating and a higher-capacity trailer rating, demonstrating why 235/75R17.5 cannot be assigned one maximum PSI.
| Manufacturer/product | Service description | Application | Maximum single load | Maximum dual load | Published product pressure |
|---|---|---|---|---|---|
| Continental Hybrid LS3 / LD3 | 132/130M | Steer or drive | 2,000 kg | 1,900 kg | Use the matching Continental table |
| Sailun SAR1 truck | 132/130M, 14 PR | Regional steer/all-position | 2,000 kg | 1,900 kg | 110 PSI (760 kPa) |
| Sailun SAR1 trailer | 143/141L, 16 PR | Regional trailer | 2,725 kg | 2,575 kg | 125 PSI (860 kPa) |
| Hankook trailer reference | 143/141, exact speed symbol product dependent | Trailer | 2,725 kg | 2,575 kg | Use the Hankook table above |
Final Recommendation
The useful distinction for 235/75R17.5 is not the size by itself. It is the complete specification: 143/141K, 143/141J, 132/130M or another manufacturer-approved combination. Match the exact service description to the correct axle-load table, respect the separate speed symbol, and verify trailer approval by product line before setting pressure.
There is no universal PSI. Use the measured axle load, single or dual configuration, and the table matching the tire’s complete service description. The 143/141 and 132/130 versions do not share the same capacity.
143 is the load index for single fitment and 141 is the load index for dual fitment. They correspond to 2,725 kg and 2,575 kg per tire respectively.
No. These are standardized load indexes and may be used by multiple manufacturers. The unique product specification includes the tire size, load indexes, speed symbol, tread line and approved application.
They have the same nominal load indexes but different speed symbols. J represents 100 km/h and K represents 110 km/h under the applicable service conditions.
Yes. Hankook lists the Smart Flex TH31 in 235/75R17.5 with a trailer-oriented specification. However, tire size alone does not prove trailer approval; verify the exact tread line and service description.
