I have an evader EXT with a team orion 12t SV2 Ball bearing motor with a LRP A.I Pro esc and its running off a duratrax 4600 and I'm seeing about 40 - 45 mph. The motor is so fast that its hard to keep in a straight line. I have the stock pinion on now(20 tooth) but I have to downsize as my temps on the motor are quite high.