Image Item No. Description  wheel1bc01 (Inv)  Train Wheel with 2 x 2 Stud Center, Beveled Tread and Cam Axle for Motor with Light Gray Train Rim for 4.5V & 12V Locomotive Wheels (wheel1b / trainrim) Catalog: Parts: Wheel & Tire Assembly  7039bc01 (Inv)  Wheel with 4 Studs and Axle Cam for Motor with Black Tire Smooth - Small Solid (7039b / 132old) Catalog: Parts: Wheel & Tire Assembly  7039bc02 (Inv)  Wheel with 4 Studs and Axle Cam for Motor with Light Gray Tire Smooth - Small Solid (7039b / 132old) Catalog: Parts: Wheel & Tire Assembly  715ac01 (Inv)  Wheel with 12 Studs and Axle Cam for Motor with Black Tire Smooth - Large Solid (715a / 36) Catalog: Parts: Wheel & Tire Assembly  715ac02 (Inv)  Wheel with 12 Studs and Axle Cam for Motor with Light Gray Tire Smooth - Large Solid (715a / 36) Catalog: Parts: Wheel & Tire Assembly