Image Item No. Description By  32007  Technic Tread Hub Catalog: Parts: Wheel 1  93595  Wheel 11mm D. x 6mm with 8 'Y' Spokes Catalog: Parts: Wheel 2  18976  Wheel 18mm D. x 12mm with Axle Hole and Stud, Solid Brake Rotor Lines Catalog: Parts: Wheel 1  55981  Wheel 18mm D. x 14mm with Pin Hole, Fake Bolts and Shallow Spokes Catalog: Parts: Wheel 1  2573  Wheel Hard Plastic Giant (71mm D. x 47mm) Catalog: Parts: Wheel 1