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  1. #1
    mtbr member
    Join Date
    Jan 2007

    Super Fat Extra Wide Sturmey Archer SX-RK3 Hub

    With speedway's $600 alum Fat frame coming out with a 165mm rear hub spacing this looks like the only option for a IGH. Has anyone else thought of using this? Any thought on it's durability? It appears to be made for chopper bikes, the original fat tired bike? (just a guess)

    Hub Shell Material - 6061 Aluminum
    Axle Diameter - 13/32 Slotted
    Axle Length - 215mm
    Over Locknut Dimension - 170mm
    Right Axle Protrusion Length - 23mm
    Left Axle Protrusion Length - 22mm
    Spoke Holes - 36
    Pitch Circle Diameter - 89.8mm
    Flange Width - 91mm
    Spoke Compatibility - 13g or 14g
    Sprocket Teeth - 13T through 22T
    Chain Line: 1/8 Flat 70.9mm
    Chain Line: 1/8 Dished 69.2mm, 72.6mm
    Chain Line: 3/32 Flat 70.6mm, 71.2mm
    Chain Line: 3/32 Dished 68.8mm, 73mm
    Indicator Chain - HSA315 Mark 3

    Weight - 1400g

    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
    mtbr member
    Join Date
    Nov 2009
    Yes, Sturmey's SX-RK3 was developed for cruiser/chopper/lowrider bikes with extra-wide rear tires&rear triangles.

    Aftermarket Sturmey hubs usually come in a "kit" complete with the sprocket, washers, nuts, shift cable and shifter, and this hub comes with a Sturmey "stick shift" gear selector (example).


  3. #3
    Frt Range, CO
    Reputation: pursuiter's Avatar
    Join Date
    May 2008
    Quote Originally Posted by dsurprise
    ...Any thought on it's durability?
    3 speed Sturmey's have never been particularly robust, the axle is hollow and tends to break under stress.

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