Gear inches in combination with internal hubs
Some typical tyre dimensions: Circumference in meter
  Brompton (Standard) 1.32
Birdy 18" (Marathon Race) 1.36
  20" 40-406 1.53
20" 47-406 1.55
  20" 54-406   (20"x1.75) 1.59
24" 47-507 1.86
  24" 54-507 1.92
26" 40-559 2.00
  26" 57-559 2.10
28" 25-622 2.13
  28" 37-622 2.19
28" 40-622 2.22
  28" 50-622 2.28
28" 60-622 2.35
 
Input:
Circumference of rear wheel (in meter)
Tooth count of front chainring
Rear cog
   
   
                 
Output:

gear-inches
 		      
  1 : 1 m-d s-d h-s-d        
 Single-Speed        
                 
                   
 Output:

gear-inches
 		        
3 speed hub (SRAM Spectro) 1 : 1 m-d s-d h-s-d   ratio gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.73 186 307 466
 2. speed   1.00      
 3. speed   1.36      
                   
                   
 Output:

gear-inches
 		        
 3 speed hub
 (Sturmey
 Archer S3X)		 1 : 1 m-d s-d h-s-d   ratio gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.63 160 264 400
 2. speed   0.75      
 3. speed   1.00      
                   
                   
 Output:

gear-inches
 		        
 5 speed hub
 (SRAM
 Spectro)		 1 : 1 m-d s-d h-s-d   ratio gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.67 224 369 560
 2. speed   0.78      
 3. speed   1.00      
 4. speed   1.28      
 5. speed   1.50      
                   
                   
 Output:

gear-inches
 		        
 7 speed hub
 (SRAM
 Spectro)		 1 : 1 m-d s-d h-s-d   ratio gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.57 305 504 763
 2. speed   0.68      
 3. speed   0.81      
 4. speed   1.00      
 5. speed   1.24      
 6. speed   1.48      
 7. speed   1.74      
                   
                   
 Output:

gear-inches
 		        
 7 speed hub
 (Shimano
 Nexus 7)		 1 : 1 m-d s-d h-s-d   ratio

 

 gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.63 244 403 611
 2. speed   0.74      
 3. speed   0.84      
 4. speed   0.99      
 5. speed   1.15      
 6. speed   1.34      
 7. speed   1.55      
                   
                   
 Output:

gear-inches
 		        
 8 speed hub
 (Shimano
 Nexus Inter-8)		 1 : 1 m-d s-d h-s-d   ratio gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.53 306 506 766
 2. speed   0.64      
 3. speed   0.75      
 4. speed   0.85      
 5. speed   1.00      
 6. speed   1.22      
 7. speed   1.42      
 8. speed   1.62      
                   
                   
 Output:

gear-inches
 		        
 9 speed hub
 (SRAM
 i-Motion 9)		 1 : 1 m-d s-d h-s-d   ratio gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.54 340 561 851
 2. speed   0.62      
 3. speed   0.73      
 4. speed   0.85      
 5. speed   1.00      
 6. speed   1.17      
 7. speed   1.38      
 8. speed   1.61      
 9. speed   1.84      
                   
                   
 Output:

gear-inches
 		        
11 speed hub
 (Shimano
 Alfine 11)		 1 : 1 m-d s-d h-s-d   ratio

 

 gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.527 409 674 1021
 2. speed   0.681      
 3. speed   0.770      
 4. speed   0.878      
 5. speed   0.995      
 6. speed   1.134      
 7. speed   1.292      
 8. speed   1.462      
 9. speed   1.667      
 10. speed   1.888      
 11. speed   2.153      
                   
                   
 Output:

gear-inches
 		        
 Rohloff
 Speedhub		 1 : 1 m-d s-d h-s-d   ratio gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
 1. speed   0.28 526 868 1315
 2. speed   0.32      
 3. speed   0.36      
 4. speed   0.41      
 5. speed   0.46      
 6. speed   0.53      
 7. speed   0.60      
 8. speed   0.68      
 9. speed   0.77      
 10. speed   0.88      
 11. speed   1.00      
 12. speed   1.14      
 13. speed   1.29      
 14. speed   1.47      
                   
                   
 Output:

gear-inches
 		        
 NuVinci CVP
 (continously
 variable
 planetary)		 1 : 1 m-d s-d h-s-d   ratio gear range of the hub in % gear range in combination with speed-drive
in %		 gear range in combination with mountain-drive or high-speed-drive
 in %
    0.50 350 578 875
    1.75