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The W in 91W after the size code indicates a speed rating. While these tires are proably Z rated (speeds in excess of 149MPH) in the tire size the W indicates that the tires are rated to a higher speed. W and X were added since there were no guidelines about how much over 149 Z rated tires were good for.

W indicates a top rated speed of 168MPH.

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The "91" indicates load capacity per tire! You'll get about 1350lbs per tire.

:)

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βˆ™ 15y ago
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Q: What does the 91W on your tire mean?
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