STI teamed up with professional racers to produce a pro-level tire that combines holeshot-grabbing traction with race-winning durability. The result was the STI Tech 2 Pro tire. These tires use a varied-pitch tread in a pattern with fewer center knobs and a concentrated shoulder formation to maximize performance in both loose and packed terrain conditions. Their light weight carcass has been strategically tuned for optimum balance of stiffness and flex. STI Tech 2 Pro tires maximize the contact patch for best traction, and preserves bump-absorption characteristics, keeping them planted for performance.