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Examples
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And the tire also has unique sipes aka slits for starting and stopping on snow and ice.
Snow-tire traction testing in Florida with the Goodyear Ultra Grip Ice WRT 2010
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The zigzag sipes in the blocks also help traction on snow and ice.
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Most winter tires have these features, but Goodyear recognized that tire sipes can cause the tread to flex and squirm, thereby negatively affecting handling and braking on pavement.
Snow-tire traction testing in Florida with the Goodyear Ultra Grip Ice WRT 2010
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To counter that affect, Goodyear designed sipes that interlock for confident cornering grip.
Snow-tire traction testing in Florida with the Goodyear Ultra Grip Ice WRT 2010
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And the tire also has unique sipes (aka slits) for starting and stopping on snow and ice.
Snow-tire traction testing in Florida with the Goodyear Ultra Grip Ice WRT 2010
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To counter that affect, Goodyear designed sipes that interlock for confident cornering grip.
Snow-tire traction testing in Florida with the Goodyear Ultra Grip Ice WRT 2010
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Most winter tires have these features, but Goodyear recognized that tire sipes can cause the tread to flex and squirm, thereby negatively affecting handling and braking on pavement.
Snow-tire traction testing in Florida with the Goodyear Ultra Grip Ice WRT 2010
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Incidentally, I'm not sure what purpose a "directional tread" serves on a wet road, since bicycles do not hydroplane--though I suppose those cosmetic sipes are useful in that once they disappear you should probably refrain from hockey stopping until you've replaced it with a brand-new pink tire.
Archive 2009-05-01 BikeSnobNYC 2009
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Incidentally, I'm not sure what purpose a "directional tread" serves on a wet road, since bicycles do not hydroplane--though I suppose those cosmetic sipes are useful in that once they disappear you should probably refrain from hockey stopping until you've replaced it with a brand-new pink tire.
Colorway Me Badd: Excessive Demands BikeSnobNYC 2009
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Now, to your question: As a tire wears out, the tread block wears down, decreasing its height in relation to the bottom of the grooves and sipes.
The Globe and Mail - Home RSS feed Rob MacGregor 2009
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