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Enter current sprocket setup
  Front Rear Ratio   RPM MPH
   
Change Front Sprocket +/- % rpm@mph mph@rpm
-2  
-1  
0  
+1  
+2  
 
Change Rear Sprocket
-4  
-3  
-2  
-1  
0  
+1  
+2  
+3  
+4  

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