How to calculate force on a wheel in a three gear system?

Hi guy
I try to understand how should I calculate the force on a wheel with known radius which is driven by a motor with a known torque and rational speed, in between three gears with known radiuses. Does the number of gears matter for the torque and so for the force on the wheel? (100% efficiency)
thx
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 you have to calculate the overall gear reduction ratio. then multiply input torque by gear ratio to get output torque. then divide away the radius of the wheel and you have the force at the wheel.
 the number of gears matter, they are the number of "stages" in a reduction.

 Tags gera, ratio, torque, wheel

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