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Greenspeed SRAM Dual Drive
The SRAM Dual Drive (DD) is the outcome of the evolution of the previous Sachs 3x7. Both feature an internally geared hub with a Shimano-compatible cassette driver to accept regular Shimano cassette sprockets. The internal hub offers a 36 per cent increase in gearing in overdrive and a reduction by the same amount in low speed. This enables you to achieve gears both higher and lower than a plain rear hub with multiple chainrings. The DD is standard equipment on the gto, gtr, gtt, gte, gts and gth. Other models can be upgraded or retro-fitted.
Standard hub, (USD$310).
SRAM
Dual Drive User
Manual in English;
more languages available.
Shipping Method UPS
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