I have a traxxas slash with an xo-1 esc and a castle 4 pole 3800 kv. I run it 6s at about 70-80,000 rpm. I Think its doing 75 to 90 mph. Has stock tires with an integy evolution chassis. My tqi says 64,000 rpm at 137 mph. You can only get a 10 runs before the motor goes over 150, but very fast. Im running 76/28 gearing and over sized slipper pads. Batteries are 2-3s 90c 4600mah orion carbon.