Image Item No. Description  4185c01 (Inv)  Technic Wedge Belt Wheel (Pulley) with Black Technic Wedge Belt Wheel Tire (4185 / 2815) Catalog: Parts: Wheel & Tire Assembly  4720c01 (Inv)  Wheel Bicycle with Black Tire (4720 / 2807) Catalog: Parts: Wheel & Tire Assembly  3464c01 (Inv)  Wheel Center Small with Stub Axles (Pulley Wheel) with Black Tire 14mm D. x 4mm Smooth Small Single (3464 / 3139) Catalog: Parts: Wheel & Tire Assembly  3464c02 (Inv)  Wheel Center Small with Stub Axles (Pulley Wheel) with Black Tire 15mm D. x 6mm Offset Tread Small (3464 / 3641) Catalog: Parts: Wheel & Tire Assembly