It's back! This early 90's stalwart has been updated with new materials, a new tread pattern, and new technology. The new version of Specialized's Ground Control Grid UST Tire is a confident-cornering tread that excels in a variety of conditions. They used finite element analysis to optimize the side knobs for grip and make the center section fast-rolling while providing great braking control. Plus, with UST technology, you can run these sweet tires at traction-enhancing low pressures without fear of pinch flats.