Image Item No. Description By  32089  Technic Tread Sprocket Wheel Dual Thin Catalog: Parts: Wheel 1  6582  Wheel 20 x 30 Balloon Medium Catalog: Parts: Wheel 59  2695  Wheel 30mm D. x 13mm (13 x 24 Model Team) Catalog: Parts: Wheel 48  60208  Wheel 31mm D. x 15mm Technic Catalog: Parts: Wheel 3