Image Item No. Description  56145c08 (Inv)  Wheel 30.4mm D. x 20mm with No Pin Holes and Reinforced Rim with Light Bluish Gray Tire 56 x 26 Tractor (56145 / 70695) Catalog: Parts: Wheel & Tire Assembly  56908c07 (Inv)  Wheel 43.2mm D. x 26mm Technic Racing Small, 6 Pin Holes with Black Tire 81.5 x 29 (56908 / 2491) Catalog: Parts: Wheel & Tire Assembly