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READING YOUR TIRE
ASPECT RATIO
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Often referred to as the profile or series, the aspect ratio of a
tire is determined by dividing a tire's section height by its
section width when the tire is:
Inflated to maximum air pressure, Mounted on the approved
measuring rim, and Under no load.
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The lower aspect ratio responds to lateral force more effectively
than a tire with a higher aspect ratio.
The aspect ratio affects steering stability. Generally, the
shorter the sidewall, or the lower the aspect ratio, the less time
it takes to transmit the steering input from the wheel to the
tread. The result is quicker steering response.
Aspect ratio also affects the tread contact patch. As a rule, a
low profile tire produces a wider tread contact patch. This wider
tread contact patch creates a stiffer footprint that reduces
distortion and provides improved cornering traction. Aspect ratio
also impacts ride. A low profile tire usually has a stiffer ride
than the standard aspect ratio of 75 or more.
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