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I read an article on the different ways to sipe and cut the knobs on tires. I read that when it comes to siping tires to only sipe the center knobs. By siping the shoulder and outer edge knobs does nothing th gain traction. At least that is what I read. But, I see countless tire manufactures doing this on the shoulder and outer edge knobs. Can anyone answer this for me. Does it or does it not give more traction?
