Rose RobustoDescription The ROS is Ultradynamico's first offering and the mainstay of their line. Double it up for optimal traction off road or pair it with their CAVA in the rear to drift the corners a bit more. Features Handles both pavement and dirt like a skilled musician handles a Stradivarius Brevet compound for longer tread life on pavement Robusto sidewall protection for getting rowdy on the one track, touring and the rambunctious, rugged chunk guzzler.