Tyre upsizing is a good way to enhance the performance and looks of your vehicle. But installing too big tyres on your car can sometimes negatively affect the handling. Tyre upsizing also results in the speedometer error. As a general rule, the diameter variation between the two tyre size should be under 3%. We have built this easy to use tyre upsize calculator for you, just enter the size of your OEM tyre and the tyre size you want to upgrade to:
How to Read Tyre Size?
The tyre size, load rating and speed rating in mentioned on the sidewall of the tyre. Example: 185/65R15 88T. Let’s see what these markings stand for:
1) Tyre Width: The first three numbers here represent tyre width in millimetres. In the above example, tyre width is 185mm.
2) Aspect Ratio/Profile: This number is used to gauge if the tyre will be high profile of low profile (height of sidewall). It is represented by two digit number after the slash mark. This number is the ratio of height of tyre’s cross-section to its width. In the above example, the tyre profile/height will be equal to 65% of 185 (tyre width).
3) Type of Tyre: There are 3 types of tyre construction: Bias Belt, Diagnol cross-ply, and Radial. The “R” letter here stands for radial tyre.
4) Rim Diameter: The two-digit number after this represents the diameter of the rim on which this tyre will be mounted. In above example, rim diameter is 15 inches.
5) Load Index: The next two-digit number after space tells the load rating on the tyre.
6) Speed Rating: The Speed rating of the tyre is represented by the letter at the end. The speed rating of the tyre should always be more than the top speed capability of the car. In the example, the speed rating is represented by “T”.
Play the Video Below to Learn How to Read Tyre Markings
Common Tyre Sizes Available in India
|12 Inch Tyre||13 Inch Tyres|
|14 Inch Tyres||15 Inch Tyres|
|16 Inch Tyres||17 Inch Tyres|
|18 Inch Tyres||19 Inch Tyres|
|20 Inch Tyres||21 Inch Tyres|
How is Tyre Upsizing Calculated?
Diameter of two tyre size is compared to each other. The size variation between them needs to be under 3%. Tyre diameter is calculated by adding rim size with (tyre sidewall height x 2).
What are the Benefits of Tyre Upsizing?
Tyre upsizing can be great for enhancing looks and road traction of your vehicle.
What are the disadvantages of Upsizing?
Some of the drawback of tyre upsizing can be increased tramlining effect, weighted steering wheel, decreased fuel efficiency, and more road noise. Therefore, use this tool to choose the right tyre size.