HPI VINTAGE RACING TIRE 31MM,NITRO3New from HPI Racing are Vintage Racing Tires. Available in 26mm and 31mm widths, these tires are specially designed for use with our Vintage wheels and bodies. The tread pattern is a symmetrical design that recreates the popular racing tires from the 60’s, and the outer sidewall has a high profile for maximum realism. Molded with our popular D compound rubber and supplied with single-piece donut inner foams, these tires deliver excellent handling on parking lot surfaces. Because of the special sidewall construction, these tires must be used on HPI Vintage Wheels.