pinion help

[BrianG]

You can use the speed calculator (link in my sig) to try different scenarious, but this is what I got using a 16T spur:

Differential Ratio: 3.25
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 16
Total Voltage: 11.1
Motor KV: 3500
Tire Diameter (inches): 3.25
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 2.88 : 1
Total Ratio: 9.34375 : 1
Tire Circumference (inches): 10.21 inches (259.34 mm)
Rollout: 1.09:1
Total Motor Speed: 38850 RPM
Vehicle Speed: 40.2 mph (64.58 km/h)
Effective KV Value: 3500
KT constant: 0.39 oz-in/A