If you're part of the 3dbotmaker racing league facebook group then you've probably seen me posting about this subject but I wanted this information to reach more people. I've noticed some people purposely bending the axles so that it runs with less friction. Well, here is a better solution to that. Coning wheels. This will greatly reduce friction and you don't have to damage any axles. You're gonna need a dremel tool, a utility blade, wire cutters to hold the axle (as shown in the picture). So what you do is you use the blade to eat the wheel from the outside to the inside while the dremel tool spins it. You can do it in whatever angle you want but I should warn you that some wheels support more aggressive angles and some don't. You have to test that for yourself. Here is an old Nascar car I dug up to demonstrate the process. I took it apart, put some weight on it (54 grams) and worked on some spare wheels I had to revive it. The 4th picture shows you how the car sits with its new wheels. I've never looked back since then. It doesn't affect stability either, cars roll nicer, better and smoother than flat wheels. Speaking of smooth, this method also skips the sanding process, as it is no longer needed. I will be posting more pictures of other cars I've done over the past year. Hope this helps anyone that wishes to be faster on the track!