The 1509 may even be overpowered for a light 2wd ST. I have a 1506 1Y in my Rustler and it absoltely flies. It has the "spunk" and fun driving characteristics of my old Caslte 5700 motor and MORE torque than a Traxxas Velineon all the while running much cooler than both motors. After 40-50 minutes zipping up and down the street on 3s (50-60 MPH geared for offroad bashing on larger tires) I got mine up to 150 and had to stop to let my MM cool down
