a Few questions as i wait for my monster

hello all first question for 5mm motor shaft does everyone shave a flat spot into it?


i have
3.3 revo conversion

RCM motor mount

medusa 36-60-2000kv motor

5s1p zippy-h 5000mah batt

talon tires 5.75"
does all this info look correct i remember looking at an 18 tooth pinion before and only getting 40-45mph which seems to be the best target speed and now i get 50-55 which is prob over geared correct?

did i make any mistakes?


Differential Ratio: 2.8461538461538463
Transmission Ratio: 2.111111111111111
Other Ratio: 1
Spur Tooth Count: 38
Pinion Tooth Count: 18
Total Voltage: 18.5
Motor KV: 2000
Tire Diameter (inches): 5.75
Tire Ballooning (inches): .4
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.11 : 1
Total Ratio: 12.68471 : 1
Tire Circumference (inches): 20.58 inches (522.67 mm)
Total Motor Speed: 37000 RPM
Vehicle Speed: 56.84 mph (91.3 km/h)
Estimated Adjusted Speed: 52 mph (84 km/h) - 8% loss
Effective KV Value: 2000
KT constant: 0.68 oz-in/A


thank you as always
jeff