I did the "secret" white wire speed hack on my RadRunner and was very pleased with the 2-3 MPH (10%) speed increase. There were no notable negative issues, and all other parts work just fine. It could be me, but it seems like there may have been a bit more torque as well (I ride on the beach, and felt it handled soft sand a bit better). Either way, for 10 minutes, and $0 (and a piece of electric tape) it is worth it! I am awaiting a new controller and display, which will accomplish this as well, but until then, I will enjoy the speed boost!