The class I race has just gone to the IMCA KK704 tire with grooving and siping allowed. Grooving and siping are new to me, and I'm looking for someone to explain the right way to do it. The best I've been able to garner from you tube and such is: Straight across for rear tires and diagonally for fronts on grooving, and shallow cuts for siping. I'm sure there's a lot more to it than that. Thanks.
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