Thread: Older vs. newer Brompton
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Old 05-25-11 | 11:35 PM
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fietsbob
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From: NW,Oregon Coast

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6 speed 10 years old, would be a SRAM/Sachs 2 by 3 speed hub,
the external sprockets, 13/15T
half step the 3 internal hubs ratios.
same internal hub ratios as the 9 by 3 dual drive.

2 years old the 3 speed would be the Aluminum shell version of the AW3
.75/1/1.33 gears.

Math :http://sheldonbrown.com/gears/internal.html
Last edited by fietsbob; 05-25-11 at 11:38 PM.
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