Upside Down Racing LLC tires designed by racers for racers! Specialized rubber compound for maximum traction brings a new definition to “STICKY”. Extreme Tread pattern that is versatile in any terrain. Hardcore racers will appreciate the ability to easily customize these tires for different environments. From crawling to full throttle hill assaults, these specially designed tires will pin you to your seat! Available now in sizes: 46/15.5/17R,  40/14/17R,  and 40/14/16.5