These are the Slick 31mm Vintage Racing Tires from HPI Racing. Rubber construction Vintage street-tread pattern Two tires Two foam inserts One instruction sheet Assembly and gluing to wheel using tire glue DTXR2000, DTXR2002 Outer Diameter: 2.5in (64mm) Inner Diameter: 1.9in (49mm) Width: 1.3in (33mm) Must be used with 31mm wide Vintage Wheel Series. cnh 4/19/08 ir/jxs &