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Stock on the 3300kV motor is 15T I believe but your motor is only a 2400kV.
Lets figure this out, if it's a Granite 3S:
TRANSMISSION RATIO: 57T Stock Spur / 15T Stock Pinion = 3.8 (Transmission ratio)
GEAR RATIO: 37T Ring gear / 13T Input gear, drive ratio of: 2.85 (Gear Ratio)
Final Drive Ratio: (3.8 X 2.85) = 10.815
We need your tire circumference which will be 6" X Pi (3.1415) = 18.85
Take the circumference and divide by your final drive ratio. 18.85/10.815 = 1.74
Now we need your max motor RPM, 2400kV @ 3S = 2400 X 11.1Volts = 26,640RPM's Max
26,640 X 1.74 = 46,353 in/min --> convert to MPH = ~44MPH
I am actually thinking the stock 15T pinion is probably fine on your setup...
I would need a mod .80?
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