😦 Should you read mentioned information of tyre before buying any kind of tire? 🤔
Now we will see the meaning of indications on tyre
1. Manufacturer's name :
2. The letter " P " and " LT " :
- For most vehicles, you’ll see the letter “P” before the number sequence begins: P225/70R16 91S. The “P” is short for “P-metric” which indicates a “passenger car” tyre type.
- If you see “LT” instead of “P,” it’s because you need “light truck” tyres – “LT” is short for “LT-metric” which indicates a “light truck” type tyre. Light truck tyres are designed to be used on vehicles capable of carrying heavy cargo or pulling trailers.
- Similarly, “T” stands for “temporary” and is for your spare tyre. If you see “ST,” that means “special trailer.”
3. Width :
The first number to appear in your tyre size information is the width, in millimeters, of the correct tyres for your vehicle: P245/45/.
Tyre width always refers to the measurement from one sidewall to another. Thus, a tyre with the measurement “P245” is for a passenger vehicle and has a nominal width of 245 millimetres.
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4. Aspect Ratio :
After the slash mark, the next number you see is for the tyre’s aspect ratio, which essentially tells you how tall your tyre’s profile is: 225/45R16 91S. Aspect ratios are delivered in percentages. Tyre makers calculate the aspect ratio by dividing a tyre’s height off the rim by its width. If a tyre has an aspect ratio of 70, it means the tyre’s height is 70% of its width.
5. construction :
After the aspect ratio comes a letter that indicates the type of internal construction maintaining your tyre’s stability: 245/45/R17.
There are two types of construction that you may see on the sidewall of a tyre:
· R – Radial
· D – Diagonal or Bias Ply
- Radial construction means the tyre’s internal ply cords are oriented in a radial direction, from one bead over to the other, essentially perpendicular to the axis of rotation.
6. Rim diameter :
- The next number is the diameter code, in inches, of the rim on to which the tyre can be mounted. For example, a tyre with the 225/70/R16 91S would fit a rim with a 16-inch diameter.
7. Load index :
- The next figure in the sequence is your tyre’s load index, which tells us how much weight, in kilograms, the tyre can support when fully inflated: 225/65/R16 92H.
- We call it the load “index” because the number doesn’t tell us the precise number of kilograms the tyre can carry, at least not by itself. However, the number does correspond to a specific load capacity listed in an index. Beginning with 60 and ending with 179, numbers in the load index represent carrying capacities of 250 to 7750 kilograms.
8. speed rating :
- The final figure in a tyre size sequence is the speed rating, which is indicated by a letter: 225/55/R16 91V. Just as your load index number corresponds to a particular load, your speed rating letter corresponds to a particular speed capability based on a standardised laboratory test.
- For example, a tyre with speed rating “S” is rated for up to 180 km/h, while a tyre rated “R” is up to 170 km/h. Remember that this isn’t a recommended cruising speed.
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