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Shimano Nexus 4-speed[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 0 0 19 78 2 1.000 1         
2 30 30 19 78 3 1.244 1  19/78 1.244
3 39 19 19 78 3 1.500 1   1/2  1.206
4 45 13 19 78 3 1.843 1 285/338 1.229

[1]
John Allen:
I counted teeth myself. Ratios are consistent with Shimano literature.