Get unheard-of traction and blinding speed with Specialized's Fast Trak GRID UST Tire. It's impressively light, offers low rolling resistance and features a high-volume casing for a plush ride and pinch-flat protection. Plus, its closely spaced center knobs with ramped edges keep you cruising fast no matter the conditions. What's more, the Fast Trak utilizes Specialized's GRID UST technology that gives you all the advantages of a tubeless system like lower pressures, no pinch flats and great traction.
Universal Standard for Tubeless (UST) tires are compatible with UST tubeless and standard rims. When used with UST tubeless rims, the tire and rim form an airtight chamber, allowing the tire to be inflated without a tube. When used with standard rims, a tubeless kit and sealant (sold separately) can be added to the rims to create an airtight seal. Both rim setups let you run lower tire pressure for optimum traction and control without fear of pinch flats. And, UST tires can be mounted and inflated with a tube on both UST tubeless and standard rims.
The high thread-per-inch casing let this tire conform to the road/trail for superior cornering and comfort.