The SRAM Dual Drive

The SRAM Dual Drive (DD) is the evolution of the previous Sachs 3x7. Both hubs feature an internally geared hub with a Shimano compatible cassette driver to accept regular Shimano cassette sprockets. The internal hub offers a 36 percent increase in gearing in overdrive and a reduction by the same amount in low. This enables you to achieve higher and lower gears 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.

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Standard hub $220 USD/$295 AUD
Disc version $245 USD/$325 AUD
Twist shifter $30/$40
Clickbox $20/26
Also available as a trike upgrade at time of order
GT3/GT5 $220 USD/$295 AUD
X3/X5 $185/$245 AUD

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SRAM Dual Drive User Manual English, more languages
Hardcore tech page, almost 7Mb.