[1]
Up: Table of Contents
Sachs, SRAM 3-speed[2]
  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 1 0.734   47/64  
2 17 15 15 47 2 1.000 1        1.362
3 17 15 15 47 3 1.362 1  17/47 1.362
[1]
John:
Calculated from tooth counts of a dualDrive hub. The ratios are suaual for Sachs/SRAM 3-speeds. The spacing of the pinions is slightly uneven.
[2]
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?