Toyota Aygo The Tires Spec
155/65 R14 75 T
155 - The width of your tire in millimeters from sidewall to sidewall.
65 - The tire “profile”. The aspect ratio is a percentage that indicates the tire’s height vs. its width. 65, meaning that this tire’s height is 65% of its width
A lower aspect ratio is often indicative of a sportier, more performance-oriented tire.
A higher aspect ratio tends to indicate the tire was designed for other priorities like comfort or rugged durability.
R - Next you will find a single letter, either a “D”, a “B”, or an “R” which indicates the construction type for the tire.
“R” indicates that the tire is a Radial tire
“D” is a Diagonal (also known as “Bias”) ply tire
“B” means it is a Belted-Bias ply tire.
Today, tires featuring Radial construction are by far the most common type. They are made with layers of fabric cords positioned at a 90’ angle to the center line of the tread. Radials became the dominant type of construction because of their superior fuel economy, traction, ride comfort and especially tread life when compared to earlier types of construction.
14 - Rim diameter—sometimes also noted as the wheel diameter. This measurement is in inches.
75 - Load index. The load index symbol indicates how much weight a tire can support.
There is a table that translates code to weight.
For example: 75 stands for 853 lbs / 387 kg
T - Speed Rating
There is a table that translates code to speed.
This indicates the top speed it’s safe to travel for a sustained amount of time.
A tire with a higher speed rating can handle heat better and provide more control at faster speeds.
T - Stands for 118 mph (189 kmh)
