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I am confused by the three three-speed hubs that Sturmey Archer offers that are supposedly the same thing (3 speed hubs with a 177% range). I can gather that the S-RF3 is simply an Aluminum version of the AW, but what is the RS-RF3 main difference? What are rotary gears? Are there differences between all three that I am missing? Any help is appreciated (also does anyone know where to purchase these online) Links

AW: http://www.sturmey-archer.com/en/products/detail/aw

S-RF3: http://www.sturmey-archer.com/en/products/detail/s-rf3

RS-RF3: http://www.sturmey-archer.com/en/products/detail/rs-rf3

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  • Err ... gears have to rotate to do anything useful :-)
    – andy256
    Commented Jul 7, 2016 at 7:36
  • Seriously, it's because these hubs use planetary gear systems.
    – andy256
    Commented Jul 7, 2016 at 7:36
  • The different is 20g and RS-RF3 has Rotary gear selector without protrusions outside the frame.
    – andy256
    Commented Jul 7, 2016 at 7:41
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    Sorry, when you ask "what are rotary gears?" are you aware that there are e.g. Wikipedia articles describing rotary gears out there already? Are you expecting someone to Google this for you?
    – PeteH
    Commented Jul 7, 2016 at 10:28
  • If people were willing to do their own research, stackexchange would not exist.
    – ojs
    Commented Jul 7, 2016 at 12:46

1 Answer 1

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RS-RF3 has a gear selector that rotates, instead of one with chain that is pulled. The rotating part is visible in service manual, look for "fulcrum lever set" and "shift actuator". As stated in comment, the supposed benefit is that no part of the mechanism protrudes outside frame.

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  • Thanks! I tried go ogling but I couldn't find anything. Thanks for your patience hahaha :)
    – Ben
    Commented Jul 8, 2016 at 22:09

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