Actually, siping should not contribute to faster tire wear, but instead, improve tread life. I agree it may lead to some chunking of the tread while playing in the rocks, but for on road applications, the sipes reduce tire squirm, reducing heat, improving tire life. Off-road, very much the same happens. The siped tire conforms to the terrain just that little bit more, giving just a little bit more traction while crawling on rocks. As far as snow or wet conditions, siping is the only way to go. The sipes provide additional edges that provide the traction. They also provide for better slow speed squeege action. A siped tire can make a lousy tread/tire design perform with the best special purpose tires. I have been running Mud T/A type tires for the past 20 years, and I keep them siped. Usually the bodies get beaten up long before the tread is worn out.
Enjoying Montana's Big Sky (& rocks & rivers & mountians etc, You get the picture.)
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