Mark Weir's signature tire, 'nough said. This beast hungers for cornering. Terraced side knobs progressively open working edges as this tire is forcefully pushed into turns. It almost does the cornering for you. Ramped center knobs and predictable, dense spacing leave no room for excuses when it comes time to setting the course record. Wanna ride like Weir Here's the secret.Based on UST and ETRTO standards, TCS tires feature square shaped, tubeless beads and dual durometer rubber compounds. AM and Team Issue tires feature additional reinforcement for demanding terrain.