How to Read tyre size

for example : 185 65 H R 13

185 :-This is the width in mm of the tyre from sidewall to sidewall when it's unstressed and you're looking at it head on (or top-down). This is known as the section width.

65 :-This is the ratio of the height of the tyre sidewall, (section height), expressed as a percentage of the width. It is known as the aspect ratio. In this case, 65% of 185mm is 120.25mm - the section height.

H :-This is the speed rating of the tyre.

R :-This tells you that the tyre is a radial construction.

13 :-This is the diameter in inches of the rim of the wheel that the tyre has been designed to fit on.

185 65 R 13 91 V

185 :- Section width

65 :- Aspect ratio

R :- Radial

13 :- Rim diameter

91 :- load rating

V :-speed rating