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Like 22:1 or 25:1
The faster a motor is, the lower its torque rating is. You can increase the torque rating with stronger magnets, ultimately theres a peak torque before you have to make the motor physically larger.
Pesto has paired a 45k with 12:1s (i think) before for shits and giggles and he was pulling something retarded like 75A.
The torque band of a motor is the range in which it runs efficiently at top speed. On industrial motors, its where they have 100% duty cycle. Ive put a 3hp motor on a 5hp application before, gets to max speed and everything, but had high draw and overheated like a bastard.
The motor will draw as much amperage as it can to get up to its maximum speed, it'll either reach the max possible draw of the battery and run slow, reach max speed and run super hot, or vaporize a winding.
Its not as easy as just pairing any motor with any gears and any spring. Its a balancing act.
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