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  1. #1
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    Sturmey Archer CS-RK3, 3x9 IGH

    Anybody ever try/saw this for offroad use? is it good for cross country riding?

    well, the internal gear is 3 speed, it imitates triple crankset, and you can use 8/9 speed cassette on it, so consider it's a 3x9 (yeah not, 27 speed IGH).

    Sturmey Archer

    CS-RK3
    Specs

    • Speed 3 x 8/9 Speed
    • Type - Freewheel
    • Hub Shell Material - 6061 Aluminum
    • Axle Diameter - 13/32” Slotted
    • Axle Length - 179mm
    • Over Locknut Dimension - 135mm
    • Right Axle Protrusion Length - 22mm
    • Left Axle Protrusion Length - 22mm
    • Spoke Holes - 36
    • Pitch Circle Diameter - 67mm
    • Center to Flange Right - 21.4mm
    • Center to Flange Left - 35.4mm
    • Flange Width - 53mm
    • Spoke Compatibility - 13g or 14g
    • Cassette Sprocket Type - 8/9 Speed
    • Max Sprocket - 34T
    • Min. Sprocket - 11T
    • Chain Line: 45mm
    • Indicator Chain - HSA716 Mark 8

    • Weight - 1155g

    Gear Ratio

    • Overall Range - 177%
    • Gear 1 - 75% (-)25%
    • Gear 2 - 100% Direct Drive (Gear 1 + 33%)
    • Gear 3 - 133% (+)33.3% (Gear 2 + 33%)

  2. #2
    Ride da mOOn Moderator
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    Thought about it but SA stuff is usually really heavy...
    ...did I figure right, that baby is 4 pounds?

    What's the cost on that unit?

    Thanks

  3. #3
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    I've been thinking about giving that hub a go on my Trek Marlin, but with single cog in back (for excellent chainline adjust ment) with a barend shifter on a Paul Thumbie for the 3 speeds. Can't actually find anyone who has ever used the hub though. The way it is marketed by SA would suggest it's durable enough (ie 3x9 replacement), and you can't beat the sub $125 price I've seen them on ebay.

  4. #4
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    it's 2.54 pounds and it's cheaper also lighter than alfine maybe it's beacuse only 3 speed internally, but with RD and cassette it must be the same (or maybe heavier?)

  5. #5
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    Adjitridika, don't think, just buy, install then ride, and deal with the risks later. :-)

  6. #6
    Ride da mOOn Moderator
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    Ok thanks...

    ...I seem to remember these being 3x7s back a while ago and I wondered why they never caught on. Now with 3x9 more usable than ever.

    Guys please keep us updated on your success.

  7. #7
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    I had one on my commuter for a while, but it was really draggy. It probably would have broken in, but I got a SRAM Dual Drive instead. I never tried it offroad, but it was much smoother than the SA. I think heavy pedaling would beat up the gears.
    Last edited by intheways; 09-25-2012 at 09:26 PM.

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