No one ever accused Duratrax of making good wheels.
Just about any aftermarket wheel will work, and last, a lot better...pin drive or hex. I use RPM wheels, pin drive, and rarely had a problem, once I switched to using music wire pins. THose roller pins don't hold up to brushless power, either. You may also find the pins inside the diff might fail (If you ever hear a grinding sound, STOP!) and music wire fixes that too. 1.57mm for the wheels, and 1.19mm for the diff. Comes in 30in lengths three to a bundle for like $3 at the hobby shop or hardware store. You'll
loose pins before you break them! And those little washers between the wheel drive pins and the bearing IS important. Problem is, you can't get them from Duratrax, there is no part number! There is a Durango part number that works. Let me know if you need it, I'll go dig it up.