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The speed rating or speed index is represented by a letter and associated with the tyre’s maximum speed capability when operating at its maximum load carrying capacity. A tyre marked with a ‘Y’ speed rating, indicates it can be safely operated at a maximum speed of 300kph.
| Speed Category Symbol | Speed (km/h) | Speed Category Symbol | Speed (km/h) | Speed Category Symbol | Speed (km/h) |
|---|---|---|---|---|---|
| A1 | 5 | E | 70 | S | 180 |
| A2 | 10 | F | 80 | T | 190 |
| A3 | 15 | G | 90 | U | 200 |
| A4 | 20 | J | 100 | H | 210 |
| A5 | 25 | K | 110 | V | 240 |
| A6 | 30 | L | 120 | W | 270 |
| A7 | 35 | M | 130 | Y | 300 |
| A8 | 40 | N | 140 | Z | *Over 240 |
| B | 50 | P | 150 | ||
| C | 60 | Q | 160 | ||
| D | 65 | R | 170 |
*Consult tyre manufacturer for Speed and Load Capacity
When the letters “ZR” are included in the tyre size and followed by a service description, the tyre speed category is that included by the service description.
| Service Description Examples: | |
|---|---|
| Tyre Description | Maximum Speed Capacity |
| 225/55R 17 97W | 270kph |
| 225/55ZR 17 97W | 270kph |
| 255/40R 17 94W | 270kph |
| 255/40ZR 17 (94)* | Over 240kph* |
*Only tyres V, W or Y are included in this category.
The tyre manufacturer must be consulted to ascertain the tyre’s maximum speed capability when the tyre has a “ZR” symbol and no service description. The “ZR” symbol must appear in the tyre size designation for tyres having a maximum speed capability of over 300kph.
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