These 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. This type of damage is not covered under the product’s warranty.
The cooler the ESC runs, the better the performance of the system.