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Center Tread Siping

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In addition to traction increases, Discount Tires quotes trucking-company tests showing that siping has increased tread life by 15-20 percent. Watson says his siped Swampers last longer too. However, one problem is shown here. Watson suspects that acceleration and torquey rock clawing have been tearing away some trailing edges of his siped tread blocks, although we've experienced that on Swampers that aren't siped.