Traxxas 48 Pitch Spur Gears are available in 45, 50 or 55 tooth count options to fine tune the gear ratio of your model.
 
Effects of Spur Gear Changes
 Gear
 Effects
 Larger Spur
Increased acceleration
Decreased top speed
Use on smaller tracks for more punch
Use with larger pinion to get more overall torque, while maintaining the same gear ratio
 Smaller Spur
Decreases acceleration, but smoother
Increases top speed