Proxes R888R Dot. Competition Tire The Proxes R888R DOT competition tire* is an evolution of the race-winning Proxes R888, providing even faster lap times and better dry handling. The credit goes to its tread design and an improved contact patch that puts more rubber on the track. Racers will also appreciate the predictable handling and how quickly the Proxes R888R reaches best-fit operating temperature. *Caution: Recommended for competition events only.