Compute Gear Ratios

How to use this program.

1. Enter your information.
2. Select maximum RPM (shift point).
3. After calculating MPH, use the chart to determine the MPH and the RPM drop for each gear. 
Example: If first gear at max RPM is 30 MPH, go to the next column and find the number closest to 30.  The corresponding RPM will be the RPM the engine will drop to when shifting to that gear.

Car Data

Gear Ratio  
1st  
2nd  
3rd  
4th  
Ring and Pinion  
Tire Size Diameter
Rollout
    Inches
cm
Maximum RPMs

RPM Gear Ratio

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