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Sachs 2-speed Duomatic, automatic[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 17 15 15 47 2 1.000 1         
2 17 15 15 47 3 1.362 1  17/47 1.362
[1]
John Allen:
I counted teeth of the 3x9. The ratios are consistent with Sachs/SRAM literature. Note, these hubs violate the dictum that sun gear plus ring gear tooth numbers must be divisible by the number of planets. The 3 planets are spaced unevenly. Maybe an earlier version had 4?