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Sturmey TC 2-speed fixed/free[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 14 21 14 54 2 1.000 1        1.156

[1]
John Allen:
Tooth counts verified
https://hadland.files.wordpress.com/2012/07/2tables.pdf