whats the highest gearing I should use?

[Urgeoner]

Thanks Shaun! You said fearing, does that mean using lol..

18/65 on 4s (what I tried) and only get about 25mph!!
on 6s it would be 37.5 mph...
Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.8333333333333333
Other Ratio: 1
Spur Tooth Count: 65
Pinion Tooth Count: 18
Total Voltage: 14.8
Motor KV: 2200
Tire Diameter (inches): 5.65
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 3.61 : 1
Total Ratio: 21.89815 : 1
Tire Circumference (inches): 17.75 inches (450.85 mm)
Total Motor Speed: 32560 RPM
Vehicle Speed: 24.99 mph (40.15 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...