Tyre Pressure & Load Calculator for Semi Trailers: PSI ↔ BAR Converter & Axle Load Optimization (2025)

Use our built-in tyre pressure converter (PSI ↔ BAR) and load-per-axle calculator to optimize trailer tyre life, fuel efficiency, braking and stability in 2025.

📅 Published on 2025-11-29 | ✍️ Semi Trailer News Engineering Desk

Image: Comparison of 17.5” vs 22.5” trailer tyres and pressure characteristics

🛞 Why Tyre Pressure Matters More Than Most Drivers Think

Tyre pressure directly affects tyre life, fuel consumption, braking distance and trailer stability. Underinflation increases rolling resistance, overheating and blowout risk — overinflation reduces grip and braking performance.

🧮 ➤ PSI ↔ BAR Tyre Pressure Converter

📏 Recommended Tyre Pressures

• 17.5” tyres: 8.0–8.5 bar (116–123 psi)
• 19.5” tyres: 8.5–9.0 bar (123–131 psi)
• 22.5” tyres: 8.5–9.5 bar (123–138 psi)

Image: Wheelbase affects axle load transfer and tyre stress during turning

⚖️ Axle Load → Tyre Pressure Relationship

Tyres support weight via air pressure. More load = more pressure required to maintain correct tyre deflection.

🧮 ➤ Axle Load Calculator (Per Tyre)

Image: Correct weight distribution ensures ideal tyre loading and temperature stability

🔥 Common Problems Caused by Wrong Tyre Pressure

• high tyre temperature (blowout risk)
• increased fuel consumption
• reduced braking performance
• irregular wear patterns
• sidewall fatigue

🏁 Conclusion

Tyre pressure is one of the most powerful — and most ignored — performance factors in road transport. Using the PSI ↔ BAR converter and axle load calculator above, drivers and fleets can optimize tyre life, safety and fuel economy throughout the year.

---

---

🔗 Related Articles