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| Sturmey AM, AM tandem[1] | ||||||||
| Number of gear teeth | ||||||||
| Gear | Sun Gear 1 | Pinion to Sun 1 | Pinion to Ring 1 | Ring gear 1 | Path, 1=R to P, 2=Direct, 3=P to R | Gear Drive Ratio | Drive ratio as fraction | Ratio incre- ment |
| 1 | 15 | 25 | 14 | 54 | 1 | 0.865 | 45/52 | |
| 2 | 15 | 25 | 14 | 54 | 2 | 1.000 | 1 | 1.156 |
| 3 | 15 | 25 | 14 | 54 | 3 | 1.156 | 1 7/45 | 1.156 |