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Transmission Ratio

The transmission ratio is the relationship of the amount of gear-teeth, the diameter and the torque from the driven- to the driving wheels. The RPM is exactly the opposite. The overall transmission ratio is
created by multiplying the individual ratios.
| Any possible intermediate gears (reverse gear) only change the direction of rotation. |
Ratio from the number of teeth |
z2 i =  z1 |
z2 = z1 · i | z2 z1 =
i |
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Ratio from diameters |
d2 i =  d1 |
d2 = d1 · i | d2 d1 =
i |
Ratio from rotary speeds |
n1 i =  n2 |
n1 = n2 · i | n1 n2 =
i |
Overall ratio in general
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iges = i1 · i2 · i3 | iges i1 =  i2 · i3 |
Overall ratio from the number of teeth, diameters |
z2·z4·z6 iges =  z1·z3·z5 |
d2·d4·d6 iges =  d
1·d3·d5 |
Overall ratio from torques |
ME iges = 
MA | ME = MA · iges | ME MA =  iges |
Overall ratio from rotary speeds |
nA iges = 
nE | nA = nE·iges | nA nE =  iges |
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