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01 BRP RS
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Well, I can't speak for cars, but I know that my roommate had a truck that went through tires like crazy and siping them made them last at least twice as long. can't say for sure about what the performance on a car would be. they do run cooler which translates to longer tread wear.
 

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Discount tired asked me if I wanted my Toyo's siped. I said hell no! Not for summer!

Just look at the Michelin Arctic Alpins I run during winter. That whole tire has millions of sipes (over exaggerating a little). It's nice and squishy for winter driving. It's a very soft pliable tire. Does great in the snow and tremendously well on ice. But it will get squirrely in the corners when they get hot.
 

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Siping is for poor weather traction - rain, snow, and ice. Not warm weather.

However, some vehicles may benefit, but I doubt ours do. :)
 

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The first ex-ex-moderator!
00 RS & GSX-R 750
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The sipes will give you better summer traction for about a week. It basiclly creates a softer more plyable contact patch, but hard driving will chew them up in no time. I would recommend it for bad weather tires but not street tires unless you have money to burn or you get tires for free like me:nuetron: .
 
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