Quick Answer: A tyre speed rating is a letter code indicating the maximum speed capability a tyre can safely maintain. It ensures the tyre’s performance matches the vehicle’s capabilities, promoting safety and optimal driving conditions.
In Australia the maximum speed limit is 110 kph, however you will see many tyres have a K rating or higher, that because you car is capable than exceeding the spped limit and although you are not going to speed, the tyre needs to be able to operate in whatever condition you may find you self in.
Understanding this code ensures you have the right tyre specification for your driving style.
Why does the correct tyre speed code matter?
Tyres are engineered to handle specific speeds and loads. Exceeding a tyre’s speed rating can lead to:
- Increased risk of blowouts: Heat generation at high speeds can lead to tyre failure.
- Reduced handling: Tyres may not grip the road properly at high speeds, compromising control.
Tyre Speed Rating chart
This tyre load rating chart shows you all the different speed rating codes – along with the corresponding speed (km/h and mph)
| Symbol Speed | Speed (km/h) | Speed (mph) |
| A1 | 5 | 3 |
| A2 | 10 | 6 |
| A3 | 15 | 9 |
| A4 | 20 | 12 |
| A5 | 25 | 16 |
| A6 | 30 | 19 |
| A8 | 40 | 25 |
| B | 50 | 31 |
| C | 60 | 37 |
| D | 65 | 40 |
| E | 70 | 43 |
| F | 80 | 50 |
| G | 90 | 56 |
| J | 100 | 62 |
| K | 110 | 68 |
| L | 120 | 75 |
| M | 130 | 81 |
| N | 140 | 87 |
| P | 150 | 94 |
| Q | 160 | 100 |
| R | 170 | 106 |
| S | 180 | 112 |
| T | 190 | 118 |
| U | 200 | 124 |
| H | 210 | 130 |
| V | 240 | 149 |
| W | 270 | 168 |
| Y | 300 | 186 |
Speed Rating vs Load Rating – What’s the Difference?
A speed rating indicates the maximum speed a tyre can safely handle, marked by a letter code. A load index number (rating), on the other hand, specifies the maximum weight a tyre can carry, represented by a numerical code.
Both ensure the tyre meets the vehicle’s performance and safety requirements.
Choosing the Right Tyre Speed Rating.
- Refer to your vehicle’s owner’s manual for the recommended speed rating for your car.
- Consider your driving habits. If you frequently drive on highways, a higher speed rating might be appropriate.
- A higher speed rated tyre doesn’t make it safer to drive at a higher speed – you should always observe the local speed limit.
Remember: Different speed ratings only apply to undamaged and properly inflated tyres. Regularly check your tyre pressure and condition to ensure safe driving.
Written By
Matt Banks
Matt is the founder of Autohero.com.au and has been hooked on cars and repairs ever since childhood.
A veteran in automotive since leaving school, Matt has completed his trade as a panel beater and is across all things with wheels.
His first car was a 1967 FORD XR Wagon followed by a string of collectable Holden’s.
Have a question for Matt? leave a comment below.
I like that you said that even while your car may go at high speeds, you shouldn’t always get tires with a higher speed rating. Instead, pick tires that will offer a good combination of safety and performance for the way you regularly operate your car. This will be beneficial to my husband, who needs to replace his worn-out tires as soon as feasible. In light of this, I’ll be sure to pass along your recommendations to him so he can pick the best tires for his car.