Ideal Mechanical Advantage of this bicycle?

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SUMMARY

The ideal mechanical advantage (IMA) of a bicycle wheel with a diameter of 73 cm driven by a chain on a gear of 8.5 cm is calculated using the formula IMA = de/dr, where de is the distance of the effort (gear diameter) and dr is the distance of the load (wheel diameter). In this case, de is 8.5 cm and dr is 73 cm, leading to an IMA of approximately 0.116. The discussion clarifies that the terms "force in" and "force out" refer to distances in this context, not forces, and emphasizes the bicycle's mechanics as a third-class lever system.

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Rionic
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A bicycle wheel has a diameter of 73cm and is driven by a chain on a gear of 8.5cm diameter

What is the ideal mechanical advantage?

I know that IMA=de/dr
But I'm not sure which one is de and which one is dr.
 
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billy_joule said:
I'm not sure where you got that equation from but the normal form is:

MA = Force in / Force out

https://en.wikipedia.org/wiki/Mechanical_advantage

Can you find the MA now? If not, can you identify the force in and force out?
Force input= 8.5 and force output=73?
 
Those are distances, in cm, not forces.
But your idea is right and will give the right answer.
One way is to consider it as a 3rd class lever, the axle is the fulcrum, the effort is applied via the chain and the load is at the tyre contact point.
 

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