When building or upgrading your electric bike or motorbike, understanding the differences between standard bicycle and motorbike tyre sizes is crucial to avoid frame clearance issues or mismatched appearances. This information is also relevant if you're considering switching to moto rims or fitting fat bike tyres on a standard bicycle frame. Below, common bicycle and motorbike tyre sizes are tabulated with their typical inch-based names in the left column and the corresponding outside tyre diameter in millimeters in the right column. Keep in mind that tyre width and profile can affect overall tyre height. For example, wider tyres are typically taller. It's wise to double-check these sizes with your supplier or measure your tyres before custom projects. To convert between inches and millimeters, multiply by 25.4 (e.g., 26" x 25.4 = 660mm) or divide by 25.4 for the reverse
|
Type of Tyre |
Approx. Outer Diameter of Tyre |
Approx. Rim Diameter |
|
Bicycle Tyres |
|
|
|
16-inch Bicycle Tyres |
406-432 mm |
349 mm |
|
20-inch Bicycle Tyres |
508-540 mm |
406 mm |
|
26-inch Bicycle Tyres |
660-700 mm |
570 mm |
|
27.5-inch Bicycle Tyres |
700-724 mm |
584 mm |
|
700C Bicycle Tyres |
700 mm |
622 mm |
|
29-inch (29er) Bicycle Tyres |
737-762 mm |
622 mm |
|
26-inch Fat Bike Bicycle Tyres |
730-800 mm |
570 mm |
|
Motorbike Tyres |
|
|
|
15-inch Motorbike Tyres |
610-686 mm |
380 mm |
|
16-inch Motorbike Tyres |
610-711 mm |
406 mm |
|
17-inch Motorbike Tyres |
635-711 mm |
430 mm |
|
18-inch Motorbike Tyres |
660-762 mm |
460 mm |
|
19-inch Motorbike Tyres |
685-787 mm |
482 mm |
|
21-inch Motorbike Tyres |
737-838 mm |
533 mm |