P225 40hr18

What is 225 / 40HR18 in tires? 3

The tire width is 225 mm.

40 is the percentage of tire height in terms of rim size.

H is the SD rating that I don't remember, but the rating is 112mm / h, go to the Stones website and there is a chart.

R for radial

And 18 required tire sizes.

225 tire height.

40 tire width.

HR is an SD series rating.

The rim diameter is suitable for 18 tires.

225 means your tires (maybe you have Tr, Suv) are 40 tire widths, r18 means tire size

Walking width is 225 mm, 40 means profile height is 40% of tread width, H sd is dimension, R means radial construction, 18 is the correct wheel size.

For your information, the height of the section is the size of the tire contact that passes through the side.

P225 40hr18

Tire width (mm) ..... / Sidewall length or height (this dimension is a percentage of the width of the tire, such as 40% of the width) ..... for the index (H means Up to 130 miles per hour). ... diameter (diameter of the edge ■■■■■■ to the tire)
Tire size, width, diameter and rim size (R18)
And SD side