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| Sturmey-Archer FC[1] | ||||||||||||||||||
| Number of gear teeth | Number of gear teeth | |||||||||||||||||
| Gear | Sun Gear 1 | Pinion to Sun 1 | Pinion to Ring 1 | Ring gear 1 | 1=R to P, P to S 2=Direct, 3=P to R | Gear Drive Ratio | Stage 1 drive ratio as fraction | Gear drive ratio modified | Sun Gear 2 | Pinion to Sun 2 | Pinion to Ring 2 | Ring gear 2 | Path: 1=R to P, 2=Direct, 3=P to R | Gear Drive Ratio | Stage 2 drive ratio as fraction | Total Drive Ratio | Total drive ratio as fraction | Ratio incre- ment |
| 1 | 30 | 14 | 14 | 60 | 1 | 0.667 | 2/3 | 20 | 20 | 20 | 60 | 1 | 0.750 | 3/4 | 0.750 | 3/4 | ||
| 2 | 30 | 14 | 14 | 60 | 1 | 0.667 | 2/3 | -0.222 | 20 | 20 | 20 | 60 | 1 | 0.750 | 3/4 | 0.900 | 9/10 | 1.200 |
| 3 | 30 | 14 | 14 | 60 | 2 | 1.000 | 1 | 20 | 20 | 20 | 60 | 2 | 1.000 | 1 | 1.000 | 1 | 1.111 | |
| 4 | 30 | 14 | 14 | 60 | 1 | 0.667 | 2/3 | -0.167 | 20 | 20 | 20 | 60 | 3 | 1.333 | 1 1/3 | 1.091 | 1 1/11 | 1.091 |