What Does 70/80 Tire Size Mean on a Tire?

The 70/80 tire size means that the tire has a width of 70mm and a height of 80% of the width. The third number in the tire size indicates the size of the rim.

For example, a motorcycle tire with a size of 90/80/17 has a width of 80mm, a height of 72mm (90% of 80), and a rim size of 17 inches.

Tire makers calculate the aspect ratio by dividing a tire’s sidewall height by its width. If a tire has an aspect ratio of 70, it means the tire’s height is 70% of its width.

Lower aspect ratio tires, such as a 60 series, generally offer vehicle handling performance advantages over higher aspect ratio tires, such as a 75 series.

In summary, the 70/80 tire size means that the tire has a width of 70mm and a height of 80% of the width. A tire’s aspect ratio is calculated by dividing the tire’s sidewall height by its width.

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