What is motorcycle tire aspect ratio?

The aspect ratio of a motorcycle tire is a numerical value that indicates the height of the tire’s sidewall as a percentage of its width. This is often expressed as a two-digit number following the tire’s width on the sidewall markings. For example, a tire with a size of 120/70R17 has an aspect ratio of 70.

The aspect ratio is important because it affects the tire’s handling and performance characteristics. A tire with a low aspect ratio (e.g., 50 or less) will have a shorter sidewall and a wider profile, which can provide better stability and handling at high speeds. A tire with a high aspect ratio (e.g., 80 or higher) will have a taller sidewall and a narrower profile, which can provide a smoother ride and better shock absorption on rough roads.

It’s important to note that the aspect ratio is only one factor that determines a tire’s performance and handling characteristics. Other factors include the tire’s width, construction, and tread design. It’s always best to consult the owner’s manual for your motorcycle to determine the correct tire size and aspect ratio for your bike.


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