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How to Read a Truck Tyre Size Marking
Break down 295/80R22.5 152/149M into section width, aspect ratio, construction, rim diameter, load index and speed symbol, using sizes that appear in the Resunyou range.
Understanding truck tyre size markings helps you match the right tyre to your vehicle, load, and road conditions. The code 295/80R22.5 152/149M appears on many Resunyou TBR truck and bus radial tyres. Each part of this code defines a critical specification. Knowing what each number and letter means ensures you select tyres that fit your wheel position, support your load index, and perform safely at your required speed. This guide breaks down the marking using only sizes and terms from the Resunyou product range.
Section Width In Millimetres
The first number, 295, indicates the tyre's section width in millimetres. This is the width of the tyre when mounted on the correct rim and inflated to standard pressure. For Resunyou TBR tyres, this measurement ensures compatibility with 22.5 inch rims. A wider section width like 295 provides more tread surface, improving traction and stability under heavy loads. Always confirm the rim width matches the tyre's recommended range to avoid uneven wear or fitment issues.
Aspect Ratio
The 80 in 295/80R22.5 is the aspect ratio. It represents the height of the tyre's sidewall as a percentage of the section width. An 80 aspect ratio means the sidewall is 80% of 295 mm, or about 236 mm tall. Higher aspect ratios offer better shock absorption on rough roads. For Resunyou radial truck tyres, this balance between sidewall height and load support helps maintain casing life, especially in long-haul or mixed-terrain operations.
Construction Type
The letter R stands for radial construction. Radial tyres like those in the Resunyou TBR range use steel belts and radial plies, which improve fuel efficiency, handling, and casing life. Radial construction reduces rolling resistance compared to bias tyres, making it ideal for fleet operators seeking lower operating costs. Resunyou offers radial OTR and TBR tyres with this construction, suitable for long-distance and heavy-duty applications.
Rim Diameter
The 22.5 in 295/80R22.5 is the rim diameter in inches. This must match the wheel size on your truck or trailer. Resunyou supplies tyres for 22.5 inch rims, commonly used in commercial vehicles across Asia, Europe, and South America. Using the correct rim diameter ensures proper fit, prevents rim damage, and maintains tyre performance. Always verify that your steel or aluminium truck wheels are rated for 22.5 inch rims before ordering.
Load Index And Speed Symbol
The numbers 152/149 indicate the load index for dual and single tyre applications. 152 corresponds to a maximum load of 5,400 kg per tyre, while 149 means 5,100 kg when used in duals. The letter M is the speed symbol, indicating a maximum speed of 130 km/h. This is critical for fleet buyers managing routes with speed limits or long-haul operations. Ensure the speed symbol matches your vehicle's operating speed to avoid safety risks.
Takeaways
- Section width must match rim width for proper fit and load support
- Aspect ratio affects ride comfort and casing life under load
- Radial construction improves fuel efficiency and retreadability
- Rim diameter must match wheel size to prevent fitment issues
Products This Guide Refers To
Frequently Asked Questions
Can I use a 295/80R22.5 tyre on a 22 inch rim?
No. The 22.5 in the size code specifies a 22.5 inch rim diameter. Using a 22 inch rim may cause improper fit, reduced load capacity, and increased risk of damage or blowout. Always match the tyre size to the wheel rim diameter.
What does the load index 152/149 mean for dual tyres?
152 is the load index for a single tyre, supporting up to 5,400 kg. 149 is for dual applications, supporting 5,100 kg per tyre. This distinction ensures you apply the correct load rating based on whether the tyre is used alone or in pairs on the same axle.
Is radial construction better than bias for long-haul trucks?
Yes. Radial construction offers lower rolling resistance, better heat dissipation, and longer casing life. Resunyou's radial TBR and OTR tyres are designed for long-haul and heavy-duty use, improving fuel economy and retreadability over bias tyres.
What certifications apply to Resunyou 295/80R22.5 tyres?
Resunyou tyres meet ISO9001, ISO/TS16949, CCC, E-mark, DOT, GSO/GCC, SONCAP, INMETRO, and NOM certifications. These apply to the TBR truck and bus radial range, ensuring compliance with international safety and quality standards.
Need This Checked Against Your Own Fleet Data
Send your axle loads, routes and current sizes. We will comment on fitment before you order.