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Hand Siping Tool

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Watson sipes his Swampers by hand using a specialty knife that's heated (shown). The knife's hot blade cuts more easily and accurately than a cold instrument could. Both Watson and Discount Tires' crew agree that sipes should be about 1/4-inch deep (give or take just a bit for tread-block height). It's best to make sipes this shallow and then resipe when the tread wears down.