Use the top speed calculator:
http://www.scriptasylum.com/rc_speed/top_speed.html
Which shows you would have a hard time gearing it for a reasonable track speed (I plugged in 46t spur and 12t pinion and got 51mph) :
Quote:
Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 12
Total Voltage: 22.20
Motor KV: 2200
Tire Diameter (inches): 4.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0.006
Spur/Pinion Ratio: 3.83 : 1
Total Ratio: 12.67949 : 1
Tire Circumference (inches): 14.14 inches (359.08 mm)
Rollout: 1.11:1
Total Motor Speed: 48840 RPM
Vehicle Speed: 51.57 mph (82.83 km/h)
Effective KV Value: 2200
KT constant: 0.61 oz-in/A
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...
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