Its not only the wheels its the axle also. The better axles are thicker and machined to a better finish. In the videos above the better rolling cars had better axles. there are three different axles in that test. and metal wheels are probably the best if they are machined to a closer tolerance. It depends on the $$. The best value for me is the old Weaver 2 rail axles with the High Rail Delrin wheels. Ride height, sound, rolling ability are my concerns in that order.
Clem
