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Rohloff Speedhub[1]
  Number of gear teeth       Number of gear teeth           Number of gear teeth            
Gear Sun Gear 1 Pinion to Sun 1 Pinion to Ring 1 Ring gear 1 1=R to P, 2=Direct Stage 1 Gear Drive Ratio Stage 1 drive ratio as fraction Sun Gear  2 Pinion to Sun 2 Pinion to Ring 2 Ring gear 2 Path: 2=Direct, 3=P to R Stage 2 Gear Drive Ratio Stage 2 drive ratio as fraction Stages 1 and 2 Drive Ratio[2] Stages 1 and 2 drive ratio as fraction Sun Gear  3 Pinion to Sun 3 Pinion to Ring 3 Ring gear 3 Path: 1=P to S, 2=Direct  Stage 3 Gear Drive Ratio Stage 3 drive ratio as fraction Total Drive Ratio[3] Total drive ratio as fraction Ratio incre- ment
1 42 24 24 90 1 0.682    15/22   42 24 24 90 2 1.000 1           0.682    15/22   51 20 26 96 1 0.409   221/541  0.279 3315/11902 [4]  
2 35 32 24 90 1 0.774    24/31   42 24 24 90 2 1.000 1           0.774    24/31   51 20 26 96 1 0.409   221/541  0.316 5304/16771 [5] 1.135
3 42 24 24 90 1 0.682    15/22   35 32 24 90 3 1.292 1    7/24   0.881   155/176  51 20 26 96 1 0.409   221/541  0.360 34255/95216 [6] 1.138
4 42 24 24 90 2 1.000 1           42 24 24 90 2 1.000 1           1.000 1           51 20 26 96 1 0.409   221/541  0.409   221/541  1.135
5 35 32 24 90 1 0.774    24/31   42 24 24 90 3 1.467 1    7/15   1.135 1   21/155  51 20 26 96 1 0.409   221/541  0.464 38896/83855 [7] 1.135
6 42 24 24 90 2 1.000 1           35 32 24 90 3 1.292 1    7/24   1.292 1    7/24   51 20 26 96 1 0.409   221/541  0.528 6851/12984 [8] 1.138
7 42 24 24 90 2 1.000 1           42 24 24 90 3 1.467 1    7/15   1.467 1    7/15   51 20 26 96 1 0.409   221/541  0.599 4862/8115 [9] 1.135
8 42 24 24 90 1 0.682    15/22   42 24 24 90 2 1.000 1           0.682    15/22   51 20 26 96 2 1.000 1           0.682    15/22   1.138
9 35 32 24 90 1 0.774    24/31   42 24 24 90 2 1.000 1           0.774    24/31   51 20 26 96 2 1.000 1           0.774    24/31   1.135
10 42 24 24 90 1 0.682    15/22   35 32 24 90 3 1.292 1    7/24   0.881   155/176  51 20 26 96 2 1.000 1           0.881   155/176  1.138
11 42 24 24 90 2 1.000 1           42 24 24 90 2 1.000 1           1.000 1           51 20 26 96 2 1.000 1           1.000 1           1.135
12 35 32 24 90 1 0.774    24/31   42 24 24 90 3 1.467 1    7/15   1.135 1   21/155  51 20 26 96 2 1.000 1           1.135 1   21/155  1.135
13 42 24 24 90 2 1.000 1           35 32 24 90 3 1.292 1    7/24   1.292 1    7/24   51 20 26 96 2 1.000 1           1.292 1    7/24   1.138
14 42 24 24 90 2 1.000 1           42 24 24 90 3 1.467 1    7/15   1.467 1    7/15   51 20 26 96 2 1.000 1           1.467 1    7/15   1.135
[1]
John Allen:
I thank Tom Ace, http://minortriad.com/ for the gear tooth counts and fractional ratios.
For a description of the workings of this hub, see the excellent animated CAD drawings (“Gears 1=14”) at http://www.rohloff.de/fileadmin/rohloffde/tour_de_hub/start_linux.html
[2]
John Allen:
This is the gear ratio after the second stage, the product of its ratio and that of the first stage.
[3]
John Allen:
This is the final drive ratio, the product of the ratios of all three stages.
[4]
John Allen:
As Excel calculates fractions only up to three places in the denominator, and gives inaccurate answers if it can not find an exact match, these numbers were entered manually as text.
[5]
John Allen:
As Excel calculates fractions only up to three places in the denominator, and gives inaccurate answers if it can not find an exact match, these numbers were entered manually as text.
[6]
John Allen:
As Excel calculates fractions only up to three places in the denominator, and gives inaccurate answers if it can not find an exact match, these numbers were entered manually as text.
[7]
John Allen:
As Excel calculates fractions only up to three places in the denominator, and gives inaccurate answers if it can not find an exact match, these numbers were entered manually as text.
[8]
John Allen:
As Excel calculates fractions only up to three places in the denominator, and gives inaccurate answers if it can not find an exact match, these numbers were entered manually as text.
[9]
John Allen:
As Excel calculates fractions only up to three places in the denominator, and gives inaccurate answers if it can not find an exact match, these numbers were entered manually as text.