Tire Circumference Calculator - Calculate Tire Size

Hello everyone,

I found a tire circumference calculator online.

http://www.golf3.de/reifen.html


It's particularly helpful if you want to register different tires.

I just quickly calculated that.

Based on the data from this device, you will get the exact speed displayed on the speedometer (using engine speed as a basis), with precise readings for all gears, etc.

-> Since the actual speed is definitely lower, the calculator likely includes the speedometer reading. Be careful!

Does anyone have measured tire dimensions for 195/65 R15 tires?

CU Gremlin.

The calculation is based on a very simple formula.

((Diameter * 25.4 + 2 * (Width * Height / 100)) * 3.1416) / 10

Okay, bitte gib mir den deutschen Text, den du übersetzt haben möchtest.

Hello,
Why is tire width included in the calculation of the overall diameter?
It shouldn't matter.

Hi Michael,

Hi,

The width is not arbitrary because the height is not absolute, but relative to the width.

A 185/55/15 is 185 mm wide, and 55% of 185 mm high. That's why it's needed, as you can see from the formula .

Otherwise, the formula is nonsense because it does not take into account either the permissible tolerance or the deformation caused by the vehicle's weight.

Ulfs formula (on page 2 of the DZR) is better.

Best regards,

Jan.

already better

but still slightly above the values of Climatronic and traffic signs.

Okay, I guess I'll have to get out the measuring tape after all...

CU Gremlin.