Tire Ratio Practice

Front

What is the aspect ratio in a tire size notation like 275/70R18?

Back

The aspect ratio is the second number in the tire size notation, which represents the height of the sidewall as a percentage of the section width. In this case, it is 70.

Front

What does the first number in a tire size notation (e.g., 275 in 275/70R18) represent?

Back

The first number represents the section width of the tire in millimeters.

Front

What does the 'R' in tire size notation (e.g., 275/70R18) indicate?

Back

The 'R' indicates that the tire is of radial construction.

Front

What is the rim size in a tire size notation like 285/75R16?

Back

The rim size is the last number in the tire size notation, which indicates the diameter of the wheel in inches. In this case, it is 16.

Front

How do you calculate the circumference of a tire given its diameter?

Back

Front

If a tire has a section width of 205 mm and an aspect ratio of 65, what is the height of the sidewall?

Back

Front

What happens to the speedometer reading if you replace factory tires with larger ones?

Back

The speedometer will read lower than the actual speed because the larger tires cover more distance per rotation.

Front

How do you convert the speedometer reading to actual speed when changing tire sizes?

Back

Front

What is the formula to find the section width of a tire given its size notation?

Back

The section width is the first number in the tire size notation, which is given in millimeters.

Front

What is the significance of the aspect ratio in tire performance?

Back

The aspect ratio affects the tire's handling, comfort, and fuel efficiency. A lower aspect ratio generally means better handling but a harsher ride.