Novak FDR Recommendations
The following article was taken from TeamNovak.com
BRUSHLESS MOTOR GEARING RECOMMENDATIONSThese gearings should be used as a starting point, but the motor and ESC temperatures should always be used to determine the final gearing. Neither the motor (with sintered rotor) nor the ESC should be hotter than 160 to 175° F after a five minute run. If either temperature is higher than 160 to 175° F , the gearing should be lowered until both the ESC and the motor (with the sintered rotor) are under this temperature.
Over gearing the motor will result in excessive operating temperatures, which may result in internal damage. The cooler the ESC runs, the better the performance of the system.
These recomendations are for "0" Timing applications.
Using standard-sized tires to calculate your FDR, first divide your vehicle's spur gear by the pinion gear, then multiply that result by the internal drive ratio of the car. The internal drive ratio can be found in the documentation that comes with your vehicle. EX. (72 spur ÷ 21 pinion) x 2.5 internal drive ratio = 8.57 FDR
FDR Gear Chart
Internal ratio: 2.47
2 Team Durango machined spur
3 Revolution Design Race Products spur
4 Stock Spur