4wd slotA 4WD car with a dual shaft motor can be easily converted for testing to 2WD by removing the front pinion. Then lap times can be compared. The same can be done with a belt drive car bySlot.it PA74 Ø17,3mm front wheels for 4WD System x2 Reference : PA74 Outside diameter 17,3 mm. 1:32 Scale 1:32 Slot.it 3,90 €. 2,73