John has posted a new article about the mechanism of the Sachs Elan/SRAM E12 12-speed internal-gear hub; the largest, heaviest, most complicated internal-gear hub ever marketed — flawed execution of a brilliant design concept. The unusual way this hub establishes its ratios carries an important lesson. In connection with that article, John has updated his article about the history of the Elan, his main page about Sachs/SRAM hubs and the internal-gear calculator.
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