MFR. No. : 870142
STOCK No. : 2668-AA1
This kit includes  front wheels with a rim (you can add a rubber O-ring tire on the rim but it is not included and not required). In addition  back wheels with a rim and a built-in gear with a 2-gear ratio. The built-in gear fits a 2mm toy motor shaft and matches the big back wheels. Finally the kit includes  axles (you can also use 1/8'' axles available for wheels).