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Your tire’s sidewall contains all the information about your tire that you’ll need. Here’s a little guide to what all those numbers and letters mean:
The width of your tire, in millimeters, measured from sidewall to sidewall.
This is the ratio of the tire’s cross-section to its width, expressed as a percentage. An aspect ratio of 65, for example, indicates that the tire’s height is 65% of its width.
The diameter (height) of the wheel in inches.
Your tire’s load index relates to its maximum carrying capacity (in kg). You’ll find the load rating of your tire on the sidewall, just to the right of the diameter.
For example, a tire with a load index of 91 can carry 615kg of weight.
Load ratings and speed ratings should be looked at together when you buy a new tire. Also remember to check your manufacturer’s recommendations.
The speed rating is the maximum speed for a tire when it is correctly inflated and being used under load. The speed rating is the letter at the end of the sidewall, after the load index number. A tire with a speed rating of V, for example, has a maximum speed of 240 km/h.
When buying new tires, make sure you match their speed rating with the speed capabilities of your vehicle.
A “P” or no letter at all indicates a passenger car tire.
The letter “R” stands for radial. Almost every new tire built today is a radial tire.
This tells you that the tire conforms to the standards of the United Nations Economic Commission for Europe (U.N.E.C.E.) in relation to pneumatic tires. Within the Middle East and Africa region, Jordan and Egypt require this today.
This is the maximum inflation pressure for your tire. Consult your vehicle's manual for more information about recommended tire pressure because it can have an impact on your car’s handling, turning, braking and fuel efficiency.
The letters “TWI” show the location of the tire’s tread wear indicators. You should check these indicators regularly to ensure there’s enough tread on your tires.
This four-digit code tells you the week and year that your tire was manufactured.