I have gotten PW wheels to roll better. Put a drop of oil with "Teflon" on each side of the wheel on the axle. Then spin the wheel. If it rolls like a flywheel, go to the next one. Then take the oil and put a small drop on each side where the truck frame enters the car frame. Then move the truck side to side. If movement is smooth, you are good to go. Not as freewheeling as fast avtion, but much better in terms of PW.
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