[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.

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?

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?