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Gear Ratio Chart/Rollout Chart

20 x 1-1/8 Wheels (with 20 x 1" tires, 19.375" inflated diameter)
Gear   34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
                                       
  9 73.2                                  
  10 65.9 67.8 69.8 71.7 73.6                          
  11 59.9 61.6 63.4 65.2 66.9 68.7 70.5 72.2                    
  12 54.9 56.5 58.1 59.7 61.4 63.0 64.6 66.2 67.8 69.4 71.0 72.7            
FREE 13 50.7 52.2 53.7 55.1 56.6 58.1 59.6 61.1 62.6 64.1 65.6 67.1 68.6 70.0 71.5 73.0    
WHEEL 14 47.1 48.4 49.8 51.2 52.6 54.0 55.4 56.7 58.1 59.5 60.9 62.3 63.7 63.8 66.4 67.8 69.2 70.6
  15 43.9 45.2 46.5 47.8 49.1 50.4 51.7 53.0 54.3 55.5 56.8 58.1 59.4 60.7 62.0 63.3 64.6 65.9
  16 41.2 42.4 43.6 44.8 46.0 47.2 48.4 49.6 50.9 52.1 53.3 54.5 55.7 56.9 58.1 59.3 60.5 60.6
  17     41.0 42.2 43.3 44.4 45.6 46.7 47.9 49.0 50.1 51.3 52.4 53.6 54.7 55.8 57.0 58.1
  18         40.9 42.0 43.1 44.1 45.2 46.3 47.4 48.4 49.5 50.6 51.7 52.7 53.8 54.9
  20               39.0 40.7 41.7 42.6 43.6 44.6 45.5 46.5 47.5 48.4 49.4
 20 x 1-1/8 Wheels (with 1-3/8 tires, 20.5" inflated diameter)​
Gear   34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
                                       
  9                                    
  10 69.7 71.8                                
  11 63.4 65.2 67.1 69.0 70.8                          
  12 58.1 61.5 58.1 63.2 64.9 66.6 68.3 70.0 71.8                  
FREE 13 53.6 55.2 56.8 58.3 59.9 61.5 63.1 64.7 66.2 67.8 69.4 71.0 72.5          
WHEEL 14 49.8 51.3 52.7 54.2 55.6 57.1 58.6 60.0 61.5 63.0 64.4 65.9 67.4 68.8 70.3 71.8 73.2  
  15 46.5 47.8 49.2 50.6 51.9 53.3 54.7 56.0 57.4 58.8 60.1 61.5 62.9 64.2 65.6 67.0 68.3 69.7
  16 43.6 44.8 46.1 47.4 48.7 50.0 51.3 52.5 53.8 55.1 56.4 57.7 58.9 60.2 61.5 62.8 64.1 65.3
  17 41.0 42.2 43.4 44.6 45.8 47.0 48.2 49.4 47.9 51.9 53.1 54.3 55.5 56.7 57.9 55.8 60.3 61.5
  18     41.0 42.1 43.3 44.4 45.6 46.7 47.8 49.0 50.1 51.3 52.4 53.5 54.7 55.8 56.9 58.1
  20           40.0 41.0 42.0 43.1 44.1 45.1 46.1 47.2 48.2 49.2 50.2 51.3 52.3
 20 x 1-3/8 (with 1-3/8 tires, 21" inflated diameter)
Gear   34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
                                       
  9                                    
  10 71.4                                  
  11 64.9 66.8 68.7 70.6                            
  12 59.5 61.3 63.0 64.8 66.5 70.0 71.8                      
FREE 13 54.9 56.5 58.2 59.8 61.4 64.6 63.0 67.8 69.5 71.1                
WHEEL 14 51.0 52.5 54.0 55.5 57.0 60.0 58.5 63.0 64.5 66.0 67.5 69.0 70.5 72.0        
  15 47.6 49.0 50.4 51.8 53.2 56.0 54.6 58.8 60.2 61.6 63.0 64.4 65.8 67.2 68.6 67.0 70.0 71.4
  16 44.6 45.9 47.3 48.6 49.9 52.5 51.2 55.1 56.4 57.8 59.1 60.4 61.7 63.0 64.3 62.8 65.6 66.9
  17 42.0 43.2 44.5 45.7 46.9 49.4 48.2 51.9 53.1 54.4 55.6 56.8 58.1 59.3 57.9 60.5 61.8 63.0
  18   40.8 42.0 43.2 44.3 46.7 45.6 49.0 50.2 51.3 52.5 53.7 54.8 56.0 54.7 57.2 58.3 59.5
  20       39.9 41.0 42.0 43.1 44.1 45.2 44.1 47.3 48.3 49.4 50.4 49.2 51.5 52.5 53.6
 20 x 1.50 (19.25" inflated diameter)​
Gear   34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
                                       
  9                                    
  10 65.5 67.4 69.3                              
  11 59.5 61.3 63.0 64.8 66.5 68.3 70.0                      
  12 54.5 56.1 57.8 59.4 61.0 62.6 64.2 65.8 67.4 69.0 70.6              
FREE 13 50.3 51.8 53.3 54.8 56.3 57.8 59.2 60.7 62.2 63.7 65.2 66.6 68.1 69.6 71.1      
WHEEL 14 46.8 48.1 49.5 50.9 52.3 53.6 55.0 56.4 57.8 59.1 60.5 61.9 63.3 64.6 66.0 67.4 68.8 70.1
  15 43.6 44.9 46.2 47.5 48.8 50.1 51.3 52.6 53.9 55.2 56.5 57.8 59.0 60.3 61.6 62.9 64.2 65.5
  16 40.9 42.1 43.3 44.5 45.7 46.9 48.1 49.3 50.5 51.7 52.9 54.1 55.3 56.5 57.8 59.0 60.2 61.4
  17   39.6 40.8 41.9 43.0 44.2 45.3 46.4 47.6 48.7 49.8 51.0 52.1 53.2 54.4 55.5 56.6 57.8
  18       39.6 40.6 41.7 42.8 43.8 44.9 46.0 47.1 48.1 49.2 50.3 51.3 52.4 53.5 54.5
  20               39.5 40.4 41.4 42.4 43.3 44.3 45.2 46.2 47.2 48.1 49.1
20 x 1.75 (19.50" inflated diameter)​
Gear   34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
                                       
  9                                    
  10 66.3 68.3 70.2                              
  11 60.3 62.0 63.8 65.6 67.4 69.1 70.9                      
  12 55.3 56.9 58.5 60.1 61.8 63.4 65.0 66.6 68.3 69.9 70.6              
FREE 13 51.0 52.5 54.0 55.5 57.0 58.5 60.0 61.5 62.2 64.5 65.2 66.6 68.1 70.5 72.0      
WHEEL 14 47.4 48.8 50.1 51.5 52.9 54.3 55.7 57.1 58.5 59.9 60.5 61.9 63.3 65.5 66.9 68.3 69.6 71.0
  15 44.2 45.5 46.8 48.1 49.4 50.7 52.0 52.6 54.6 55.9 56.5 57.8 59.0 61.1 62.4 63.7 65.0 66.3
  16 41.4 42.7 43.9 45.1 46.3 47.5 48.8 50.0 52.4 51.7 52.9 54.1 55.3 57.3 58.5 59.7 60.9 62.2
  17   40.1 41.3 42.4 43.6 44.7 45.9 47.0 48.2 49.3 49.8 51.0 52.1 53.9 55.1 56.2 57.4 58.5
  18     39.0 40.1 41.2 42.3 43.3 44.4 45.5 46.6 47.1 48.1 49.2 50.3 52.0 53.1 54.2 55.3
  20             39.0 40.0 41.0 41.9 42.9 43.9 44.9 45.8 46.8 47.8 48.8 49.7
24 x 1-1/8 (520mm rims, 22.625" inflated diameter)
Gear   34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
                                       
  9                                    
  10                                    
  11 69.9 72.0                                
  12 64.1 66.0 67.9 69.8 71.6                          
FREE 13 59.2 60.9 62.7 64.4 66.1 67.9 69.6 71.4                    
WHEEL 14 54.9 56.6 58.2 59.8 61.4 63.0 64.6 66.3 67.9 69.5 71.1              
  15 51.3 52.8 54.3 55.8 57.3 58.8 60.3 61.8 63.4 64.9 66.4 67.9 69.4 70.9        
  16 48.1 49.5 50.9 52.3 53.7 55.1 56.6 58.0 59.4 60.8 62.2 63.6 65.0 66.5 67.9 69.3 70.7 72.1
  17  45.3 46.6 47.9 49.2 50.6 51.9 53.2 54.6 55.9 57.2 58.6 59.9 61.2 62.6 63.9 65.2 66.5 67.9
  18 42.7   44.0 45.3 46.5 47.8 49.0 50.3 51.5 52.8 54.0 55.3 56.6 57.8 59.1 60.3 61.6 60.8 64.1
  20   39.6 40.7 41.9  43.0 44.1 45.5 46.4 47.5 48.6 49.8 50.9 52.0 53.2 54.3 55.4 56.6 57.7
24 x 1.50 (with 24 x 1.50 tires, 22.50" inflated diameter)
Gear 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
9
10
11 69.5
12 63.8 65.6 67.5 69.4 71.3
FREE 13 58.8 60.6 62.3 64.0 65.8 67.5 69.2 71.0
WHEEL 14 54.6 56.3 57.9 59.5 61.1 62.7 64.3 65.9 67.5 69.1 70.7
15 51.0 52.5 54.0 55.5 57.0 58.5 60.0 61.5 63.0 64.5 66.0 67.5 69.0 70.5
16 47.8 49.5 50.6 52.0 53.4 54.8 56.3 57.7 59.1 60.5 61.9 63.3 64.7 66.1 67.5 68.9 70.3
17 45.0 46.3 47.6 49.0 50.3 51.6 52.9 54.3 55.6 56.9 58.2 59.6 60.9 62.2 63.5 64.9 66.2 67.5
18 42.5 43.8 45.0 46.3 47.5 48.8 50.0 51.3 52.5 53.8 55.0 56.3 57.5 58.8 60.0 61.3 62.5 63.8
20 39.4 40.5 41.6 42.8 43.9 45.0 46.1 47.3 48.4 49.5 50.6 51.8 52.9 54.0 55.1 56.3 57.4
24 x 1.50 (with 24 x 1.75 tires, 23" inflated diameter)
Gear   34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
                                       
  9                                    
  10                                    
  11 71.1                                  
  12 65.2 67.1 69.0 70.9                            
FREE 13 60.2 61.9 63.7 65.5 67.2 69.0 70.8                      
WHEEL 14 55.9 57.5 59.1 60.8 62.4 64.1 65.7 67.4 69.0 70.6                
  15 52.1 53.7 55.2 56.7 59.8 59.8 61.3 62.9 64.4 65.9 67.5 69.0 70.5          
  16 48.9 50.3 51.8 53.2 56.0 56.1 57.5 58.9 60.4 61.8 63.3 64.7 66.1 67.6 69.0 70.4    
  17 46.0 47.4 48.7 50.1 51.4 52.8 54.1 55.55 56.8 58.2 59.5 60.9 62.2 63.6 64.9 66.3 67.6 69.0
  18 43.4 44.7 46.0 47.3 48.6 49.8 51.1 52.4 53.7 54.9 56.2 57.5 58.8 60.1 61.3 62.6 63.9 65.2
  20  39.1 40.3 41.4 42.6 43.7 44.9 46.0 47.2 48.3 49.5 50.6 51.8 52.9 54.1 55.2 56.4 57.5 58.7
24 x 1.75 w/24 x 1.75 tires or old 24 x 1-3/8 Tires on 520mm rims(24" inflated diameter)
Gear   34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
                                       
  9                                    
  10                                    
  11                                    
  12 68.0 70.0                                
FREE 13 62.8 64.6 66.5 68.3 70.0                          
WHEEL 14 58.3 60.0 61.7 63.4 65.1 66.9 68.6 70.3                    
  15 54.4 56.0 57.6 59.2 60.8 62.4 64.0 65.6 67.2 68.8 70.4              
  16 51.0 52.5 54.0 55.5 57.0 58.5 60.0 61.5 63.0 64.5 66.0 67.5 69.0 70.5        
  17 48.0 49.4 50.8 52.2 53.6 55.1 56.5 57.9 59.3 60.7 62.1 63.5 64.9 66.4 67.8 69.2 70.6  
  18 45.3 46.7 48.0 49.3 50.7 52.0 53.3 54.7 56.0 57.3 58.7 60.0 61.3 62.7 64.0 64.0 66.7 68.0
  20 40.8 42.0 43.2 44.4 45.6 46.8 48.0 49.2 50.4 51.6 52.8 54.0 55.2 56.4 57.6 57.6 60.0 61.2