# Tyre Knowledge
Conversion Chart Motorcycle Tyre Sizes
Metric - Inch - Alpha
In this table you can find the approximate conversation of metric to inch and alpha sizes.
Please note that with any difference from original sizes the rolling circumference changes and the tyre clearance needs to be checked. Pay attention to the load index and adjust inflation pressure of the tyre. Please follow the instructions of the vehicle manufacturer.
| Front | Rear | |||||
| Metric | Inch | Alpha | Metric | Inch | Alpha | |
| 80/90 | 2.50, 2.75 | MH90 | 110/90 | 4.00, 4.25 | MP85 | |
| 90/90 | 2.75, 3.00 | MJ90 | 120/90 | 4.50, 4.75 | MR90 | |
| 100/90 | 3.25, 3.50 | MM90 | 130/90 | 5.00, 5.10 | MT90 | |
| 110/90 | 3.75, 4.00 | MN90 | 140/90 | 5.50, 6.00 | MU85/MU90 | |
| 120/90 | 4.25, 4.50 | MR90 | 150/80 | 6.00, 6.25 | MV85 | |
| 130/90 | 5.00, 5.10 | MT90 | ||||