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Gear Wizard
 

Gear Inch/Actual Rollout Calculator
Enter the values in the three boxes below and press the "Calculate Gear Inches" button.
  
Front Gear Size (teeth):
Freewheel Size (teeth):
Wheel Height in Inches:
(from ground to top of tire) 		 (ex: 19.0 or 20.5)
20 x 1.75 = 19.5" 20 x 1.50 = 19.0" 20 x 1.375 = 20.5" 20 x 1.125 = 20.0"
24 x 1.75 = 23.5" 24 x 1.50 = 23.0" 24 x 1.375 = 24.0" 24 x 1.125 = 22.6"
these sizes are for general reference - actual tire diameter varies from brand to brand
 
   
The Gear Inch Calculation Is...
  
Distance traveled in one full crank revolution (measured in inches):
    
If you used a  chainring, you would travel  inches.
   
If you used a  chainring, you would travel  inches.
   
If you used a  freewheel, you would travel  inches.
   
If you used a  freewheel, you would travel  inches.
   
   

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