Tire Size Comparison Calculator

Size 1 (original tire size)

/ R

Size 2 (new tire size)

/ R

Size 1

Size 2

Width

Diameter

Sidewall

Circum.

Revs

Ground Clearance

inchesmm

Tire Size Comparison Visualizer

Width

Dia.

Width

Dia.

Rim

Wall

Revs/km

Circ.

Rim

Wall

Revs/km

Circ.

regularoff-road

Speedometer Error

Speed* 20 mph 30 mph 40 mph 50 mph 60 mph 70 mph 80 mph

Actual

* Set Size1 to OEM size.

How to Use?

Just input any two tire Sizes and click on the «Compare» button. Our calculator will instantly calculate the differences between the tires diameter, width, sidewall, circumference and revolutions per mile, and then display the data in a table and show a visual comparison with examples of your speedometer reading.

How to Find Your Tire Size

Driver Door Jamb: Open the driver's door and look for a white and yellow sticker.
Tire Sidewall: Look at the outer side of your current tire for printed numbers.
Owner's Manual: Check your glove box book.

Reading a Tire Code (Example: P225/75R16)

P: Passenger vehicle type.
225: Width in millimeters from side to side.
75: Aspect ratio, meaning sidewall height is 75% of the width.
R: Radial internal construction.
16: Wheel or rim diameter in inches

Check out our Educational Center to learn all about tires and wheels.