As the HookWorm tire was being developed, a few of Maxxis' 20-inch pros requested a tread pattern that covered the entire sidewall. Their old-school tires were wearing through the sidewalls too quickly when doing rails, thus shortening the life of the tire. The idea was to get more performance and longevity for freestyle riders that run pegs. The result is a directional tread that encompasses the entire tire from rim edge to rim edge. The additional tread on the sidewalls prevents premature wear, hooks on walls, rails and coping. 70a durometer. 110 psi.