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| Tire Conversion Chart |
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There are three different systems of tire measurement in use:
1. Inch System (it is well known from tire size readings like 5.00-16 or 4.50/S/18)
2. Alphanumeric System (the descriptions on tires are like MT 90-16 or MJ90-19)
3. Metric System (for example 130/90-16).
The last numbers are easy to read. They describe the rim size (which is equal with the inner diameter of the tire). Before that number there is normally a dash (-) or one of the letters H, S or V. This is the key to the speed range: (H) tires are admissible for speeds up to 130MPH, (S) tires are up to 112MPH, (V) tires for 150MPH and up. Series 90, Alphanumeric System and Series 80 are describing low-profile tires which means the height is smaller than the width and the proportions to the width is fixed (90% or 80% of the nominal width). Only in the Standard Inch-System can we find tires with equal width and height, which is then a square-profile.
| Metric |
Alpha Numeric |
Inch-System |
| 80/90 |
MH90 |
2.50 to 2.75 |
| 90/90 |
MJ90 |
2.75 to 3.00 |
| 100/90 |
MM90 |
3.25 to 3.50 |
| 110/90 |
MN90 |
3.75 to 4.00 |
| 120/80 |
|
4.25 to 4.50 |
| 120/90 |
MR90 |
4.25 to 4.50 |
| 130/80 |
|
5.00 to 5.10 |
| 130/90 |
MT90 |
5.00 to 5.10 |
| 140/80 |
|
5.50 to 6.00 |
| 140/90 |
MU90 |
5.50 to 6.00 |
| 150/80 |
MV85 |
6.00 to 6.25 |
| 150/90 |
MV85 |
6.00 to 6.25 |
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