Image Item No. Description By  4185  Technic Wedge Belt Wheel (Pulley) Catalog: Parts: Wheel 1  6014b  Wheel 11mm D. x 12mm, Hole Notched for Wheels Holder Pin Catalog: Parts: Wheel 1  11208  Wheel 14mm D. x 9.9mm with Center Groove, Fake Bolts and 6 Double Spokes Catalog: Parts: Wheel 1  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  44772  Wheel 56mm D. x 34mm Technic Racing Medium, 3 Pin Holes Catalog: Parts: Wheel 1  27254  Wheel Hard Plastic with Large Cleats and Flanges Catalog: Parts: Wheel 1