Find your tyres by Size

Michelin Tyre Size

How do I determine my tyre's size?

How do I determine my tyre's size?

To find your vehicle's original equipment tyre size please check the following:
- The tyre information located on the driver's door jamb
- Your owner's manual
- On the glove compartment door
- Inside the fuel hatch or trunk lid

You can also check your existing tyre's designation on the sidewall. However, there is no guarantee that this is the original tyre size unless they came on the vehicle new.


This three-digit number represents the width of the tyre in millimeters (mm), measured from sidewall to sidewall. Since this measure is affected by the width of the rim, the measurement is done when the tire is on its intended rim size.


Aspect ratio
The aspect ratio is the relationship of a tyre's sidewall height to its section width, expressed as a percentage. In this example, the tire sidewall height is approximately 55% of the tyre width. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall.


Rim size
The diameter of the rim in inches.


Load index
An assigned number ranging from 0 to 130 that corresponds to the load-carrying capacity of a tyre. The higher the tyre's load index number, the greater its load carrying capacity.


Speed Rating
The speed rating indicates the maximum speed at which a tyre can carry a load under specified service conditions. Speed ratings for most car and light truck tyres range from L (the lowest) to Z & (Y) (the highest).


Other ways to find your tyres