Shopping for aftermarket tires can be daunting. It may involve visiting several stores to make inquiries, compare prices and verify sizes. It gets complicated if you are juggling between metric and imperial tire sizes. We want to simplify your search. We have created a comparative tire size chart for your reference.
Check out the tire size for your vehicle
A raised area in the tread grooves which becomes even with the tread surface when the tire is worn to 2/32” tread depth; used to define the legal wear-out point in a tire’s life.
Tire Pressure Monitoring System - device mandated by the NHTSA (USA) to help motorists maintain proper tire air pressure.
The diameter of the bead seat, not the diameter of the rim edge.
A tire built with casing plies that cross the crown at an angle of 90 degrees.
A tire sizing system using the section width in millimeters, aspect ratio, type of tire construction, rim diameter in inches, load index and speed symbol (e.g.: P225/70R15 100S).
The maximum height of a tire when mounted on a wheel and inflated to rated pressure.
Before purchasing any tire, first, identify its correct size. Aftermarket tires are manufactured to standard sizes. But how exactly do you know the right size so that the performance of your car isn’t affected?
Check the doorjamb or the owner’s manual for the recommended size.
On the old tire’s sidewall is a string of letters and numbers. An example is 215/70R18 91 S. The correct size for this radial tire is 18 inches.
Since aftermarket tires are manufactured in different countries, there is a likelihood that you will be replacing a metric tire with a tire sized using the inch standards or vice versa. It should not worry you. Let’s consider the tire sized as 215/70R18
Change the tire width from mm to inches by dividing by 2.54, that is, 215/2.54, giving the inch equivalent as 8.46''
The number 70 is the aspect ratio and is represented as a percentage
The last number, 18 is the wheel diameter in inches.
To calculate the section height, multiply the tire width by the aspect ratio. 8.46''*0.7=5.92''
The tire diameter is calculated by multiplying section height by two and adding the wheel diameter. 5.92''*2+18''=29.84''
Note that we do not stock or sell any tires. Our converters and calculators are designed to help you convert between the two units and improve your tire sizing skills. Those numbers shouldn’t be a bother anymore.