Tire calculator

Tire Calculator on-line will help calculate all the changes in the car after installing specific tires on a particular vehicle. Using this program is completely simple, you fill in the specified sections and wait for the result, which appears in a couple of seconds. To ensure the calculator shows the correct result, you need to specify the exact required vehicle parameters. In this case, you will easily find out the compatibility of the tires with the car. The calculator will help calculate the impact of a specific tire on the car's speed. Only then will you know what the potential consequences of tire changes might be.

Why you need a tire calculator:

With this tire calculator, you can easily calculate how the external dimensions of the wheel, the ride height will change (clearance), speedometer readings and other characteristics, when installing tires of a different size on your car.

How to use:

First enter the size installed on your car, and then the one you want to install and press «calculate».
The results of the calculations will be shown in the table below.

Instruction

- Specify the wheel parameters.
- Click "Calculate".

•	When increasing the wheel disc diameter, and as a result, reducing the tire profile height, the load on the car suspension increases, and comfort deteriorates (the car will become noticeably stiffer).
•	Speedometer error depends on the car's speed; as speed increases, the error increases.

Attention! Installing non-standard sizes can lead to deterioration of the car's characteristics and the destruction of the tire itself. It is best to choose from the sizes recommended by the manufacturer of your car.

Old size	145 155 165 175 185 195 205 215 225 235 245 255 265 275 285 295 305 315 325  / — 25 30 35 40 45 50 55 60 65 70 75 80 85  R 12 13 14 15 16 17 18 19 20 21 22 23 24
New size	145 155 165 175 185 195 205 215 225 235 245 255 265 275 285 295 305 315 325  / — 25 30 35 40 45 50 55 60 65 70 75 80 85  R 12 13 14 15 16 17 18 19 20 21 22 23 24

Sizes	Old	New	Comparison
Tire width, mm (A)
Profile height, mm (B)
Internal diameter, mm (C)
External diameter, mm (D)

Speedometer
Speedometer readings (km/hr)
Real speed (km/hr)
Difference (km/hr)
Clearance change (mm)