Sturmey Archer Rear Hub
3 Speed Hub |
Pecentage of direct drive |
1 st gear |
74.19 % |
percent |
| 100.00 % |
percent |
| 132.26 % |
percent |
|
2 nd gear |
3 rd gear |
5 Speed Hub |
|
1 st gear |
66.13 % |
percent |
| 79.03 % |
percent |
| 100.00 % |
percent |
| 125.81 % |
percent |
| 146.39 % |
percent |
|
2 nd gear |
3 rd gear |
4 th gear |
5 th gear |
|
Sram Spectro Rear Hub
3 Speed
Hub |
Pecentage of direct drive |
1 st gear |
73.00 % |
percent |
| 100.00 % |
percent |
| 136.00 % |
percent |
|
2 nd gear |
3 rd gear |
Dual Rear
Derailleur with 3 Speed Hub |
Small rear |
1 st gear |
73.00 % |
percent |
| 100.00 % |
percent |
| 136.00 % |
percent |
| 73.00 % |
percent |
| 100.00 % |
percent |
| 136.00 % |
percent |
|
sprocket |
2 nd gear |
(engaged) |
3 rd gear |
Large rear |
1 st gear |
sprocket |
2 nd gear |
| (engaged) |
3 rd gear |
|
Mountain Drive Gearing
|
Pecentage of direct drive |
Direct Drive |
100.00 % |
percent |
250.00 % |
percent |
|
Low Drive |
|
Herein are the Standard
Offerings from Brompton. Other combinations can be requested. |
|
| Brompton Standard Gearing |
|
| No Gear Reduction |
|
Chain Ring |
|
| Standard ratio |
3.846 to 1 |
|
|
Rear sprocket |
|
| Reduced Gearing Options |
|
7 % Gear Reduction |
|
Chain Ring |
|
| 7% Reduced Ratio |
3.571 to 1 |
|
|
Rear sprocket |
12 % Gear Reduction |
|
Chain Ring |
|
| 12% Reduced Ratio |
3.385 to 1 |
|
|
Rear sprocket |
18 % Gear Reduction |
|
Chain Ring |
|
| 18% Reduced Ratio |
3.143 to 1 |
|
|
Rear sprocket |
23 % Gear Reduction |
|
Chain Ring |
|
| 23% Reduced Ratio |
2.933 to 1 |
|
|
Rear sprocket |
|
| Single Chain Ring Options
|
Single Rear Sprocket Options
Standard |
13 |
teeth |
14 |
teeth |
15 |
teeth |
|
Reduced Gearing |
Further Reduced Gearing |
|
Front Dual Derailleur Offering
Large sprocket |
|
Small sprocket |
|
Rear Dual Derailleur Offering
Large sprocket |
|
Small sprocket |
|
|