Image Item No. Description  3139  Tire 14mm D. x 4mm Smooth Small Single Catalog: Parts: Wheel, Tire & Tread  x486  Tread with 30 Treads Catalog: Parts: Wheel, Tire & Tread  x486a  Tread with 30 Treads Small Wedge-Shaped Catalog: Parts: Wheel, Tire & Tread