Automotive How to Calculate Gear Speed in RPM?

  • Thread starter Thread starter The Jargon
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    Gear Rpm Speed
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To calculate gear speed in RPM, one must consider the input shaft speed, output shaft speed, gear ratios, and tire size. The discussion clarifies that "gear speed" refers to the speed at which the gears are spinning, which matches the speed of the shafts. The input shaft typically refers to the transmission input shaft, and understanding what drives or controls this speed is crucial. The conversation emphasizes the importance of correctly identifying the components involved in the calculation. Accurate calculations depend on these factors to determine the effective RPM.
The Jargon
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Hi guys,

How would I go about calculating gear speed in rpm? If I know the input shaft speed, output shaft speed, gear ratios and tyre size.

Thanks.
 
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What do you mean by 'gear speed' in rpm?
 
xxChrisxx said:
What do you mean by 'gear speed' in rpm?

How fast the gear is spinning.
 
Well they'd be spinning at the same speed as the shafts.
 
Sorry I meant engine speed haha, don't know why I said gear speed.
 
By input shaft, I assume you mean transmission input shaft.

What is driving / controlling the speed of this shaft?
 

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