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Shimano Nexus Inter 3[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 16 13 13 44 1 0.733   11/15  
2 16 13 13 44 2 1.000 1        1.364
3 16 13 13 44 3 1.364 1   4/11 1.364
[1]
John Allen:
I counted teeth of the fing gear in the disassembly/reassembly instructions at http://bike.shimano.com/publish/content/global_cycle/en/us/index/tech_support/tech_tips.download.-Par50lparsys-0023-downloadFile.html/15)%20Inter%203%20ohaul.pdf. Other tooth counts follow from this and from published data on ratios. The tooth count for the planet gears is not sure, but does not affect the ratios.