About
Truck-Size is an independent, free reference that brings truck, tractor-unit, bus, light commercial vehicle and trailer tire sizes together in one place.
Truck-Size was created so that haulers, fleet managers, drivers, tire dealers and workshops can answer "Which tire fits this vehicle?" reliably in seconds. We publish the factory steer-axle, drive-axle and trailer-axle tire sizes of truck, bus and trailer manufacturers worldwide, in 9 languages.
Our mission
To base commercial-vehicle tire choices on data, not guesswork. The right size matters for load capacity, fuel consumption, speedometer and tachograph accuracy, braking performance and road safety.
Data policy
- Primary sources: Vehicle–tire fitments come first from manufacturers' technical data sheets, brochures and body/chassis documentation.
- Secondary sources: When no primary source is available, authorized dealer documents and established technical publications are used.
- Tire dimensions: Overall diameter, width, load and speed index come from tire makers' public catalogs; sizes not listed are calculated with standard formulas and marked "≈".
- No guessing: Unverified sizes are never published as factory data. Suggestions derived from similar vehicles are always labeled separately as recommendations.
- Continuous updates: The database is updated regularly with new models, model-year changes and user reports.
Independence
Truck-Size is independent and is not the official site of any tire, truck, bus or trailer manufacturer. Factory size data is never influenced by commercial partnerships. Brand and model names are used for identification only and belong to their owners.
Sister site
For tractor and agricultural tires, visit our sister site Tractor-Size.
Feedback
If you spot an error or a missing model, let us know. Every report is reviewed and added to the database once verified.