Look up front and rear tyre sizes for modern motocross motorcycles in the MXOwners.com database.
Select a manufacturer and motorcycle below to view its recorded front and rear tyre sizes.
Select a manufacturer and bike to show tyre sizes.
Modern motocross tyres are normally marked using a metric width, aspect ratio and rim diameter.
| Example | Meaning |
|---|---|
| 80/100-21 | 80 mm nominal width, 100% aspect ratio and 21-inch rim diameter. |
| 100/90-19 | 100 mm nominal width, 90% aspect ratio and 19-inch rim diameter. |
| 110/90-19 | 110 mm nominal width, 90% aspect ratio and 19-inch rim diameter. |
| Application | Common Rim Diameter |
|---|---|
| Full-size motocross front | 21 inch |
| Full-size motocross rear | 19 inch |
| Smaller / youth motocross bikes | Varies by motorcycle and wheel configuration |
| Check | Why It Matters |
|---|---|
| Motorcycle year and model | Tyre and wheel specifications can change between model years. |
| Front and rear size | Confirm the specified tyre size before ordering. |
| Rim diameter | The tyre must match the wheel rim diameter. |
| Tyre width | Excessive width can cause chain, swingarm or fork clearance problems. |
| Tube or tube-type requirements | Check the tyre, rim, tube and rim-lock arrangement fitted to the motorcycle. |
| Terrain | Choose a tread pattern and compound suitable for the intended riding conditions. |
| Rotation direction | Some tyres have a specified direction of rotation marked on the sidewall. |
Full-size motocross motorcycles commonly use a 21-inch front wheel.
The front tyre has a major influence on steering feel, braking grip and confidence when entering corners.
Full-size motocross motorcycles commonly use a 19-inch rear wheel, although the exact tyre width and profile varies between motorcycles.
Always check chain, swingarm and mudguard clearance before fitting a tyre that differs from the specified size.
Tyre pressure affects traction, steering, carcass movement and resistance to pinch damage.
The appropriate pressure depends on the motorcycle, tyre construction, tube or mousse arrangement, terrain and riding conditions.
Use the motorcycle and tyre manufacturer's recommendations as the starting point.
Many motocross wheels use a rim lock to help prevent the tyre from rotating on the rim under acceleration or braking.
Inspect the rim lock, tube, valve stem and rim condition whenever changing a tyre.