This is the D-Compound 26mm Vintage Slick Racing Tire from HPI Racing. Rubber construction Vintage slick Two tires Two foam inserts One instruction sheet Assembly and gluing to wheel using tire glue, (DTXR2000) Outer Diameter: 64.3mm (2.53") Inner Diameter: 47.5mm (1.87") Width: 27.5mm (1.08") Must be used with 26mm Narrow Vintage Wheel Series cnh 6/10/08 ir/jxs &