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| Sturmey-Archer FM[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 1 | Ring gear 1 | 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[2] | 14 | 60 | 1 | 0.667 | 2/3 | 30 | 14 | 14 | 60 | 1 | 0.667 | 2/3 | 0.667 | 2/3 | |||
| 2 | 30 | 14 | 14 | 60 | 1 | 0.667 | 2/3 | -0.333 | 30 | 14 | 14 | 60 | 1 | 0.667 | 2/3 | 0.857 | 6/7 | 1.286 | |
| 3 | 30 | 14 | 14 | 60 | 2 | 1.000 | 1 | 30 | 14 | 14 | 60 | 2 | 1.000 | 1 | 1.000 | 1 | 1.167 | ||
| 4 | 30 | 14 | 14 | 60 | 1 | 0.667 | 2/3 | -0.222 | 30 | 14 | 14 | 60 | 3 | 1.500 | 1 1/2 | 1.125 | 1 1/8 | 1.125 | |