Surly Big Fat Dummy cargo bike frameset

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  • Big Fat Dummy
    Off-road Long Tail Cargo Bike

    Big Fat Dummy is a fat-tire, long-tail cargo bike that took a few too many doses of growth hormones.

    Big Fat Dummy is truly a hulking beast of a bike. Maximalist bikepackers, those looking to make bikepacking a family affair, and those that help maintain their local trails will appreciate the Big Fat Dummy hauling abilities.

    At first glance, it might just seem like a beefed-up version of Big Dummy, but that’s actually not the case. Specifically designed around fat tires, it has a longer toptube and slacker headtube offering the most stable, stiff, and predictable ride possible while hauling a lot of cargo.

    • Single-piece frame increases stiffness and decreases torsional flex
    • Human cargo compliant with the use of Dummy Rail Collars
    • Three-pack mounts, double water bottle bosses on seattube, internal dropper post routing
    • Clearance for 26" x 5.25" tires or 29” x 3.0” tires


    Frame Specs
    • Frame Construction: 4130 Chromoly, Natch tubing, double-butted main triangle, trumpet flaired tubes, TIG welded, ED coated
    • Fork Construction: 4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated
    • Rear Dropout Configuration: Vertical
    • Rear Hub Spacing: 12 x 197mm (Surly axle included) / 10 x 190mm with Surly 10/12 Adapter Washers (not included)
    • Front Hub Spacing: 15 x 150mm (Surly axle included)
    • Rear Brake: Disc 51mm I.S. (203mm max rotor)
    • Front Brake: Disc 51mm I.S. (203mm max rotor)
    • Head Tube: Ø44mm
    • Steerer Tube: Ø28.6mm (1-1/8")
    • Crown Race: Ø30mm (1-1/8")
    • Stock Headset Upper (S.H.I.S.): ZS44/28.6
    • Stock Headset Lower (S.H.I.S.): EC44/30
    • Seat Collar: Ø33.1mm
    • Seat Post: Ø30.9mm




    Geometry



    SMMDLG
    Reach408432448
    Stack578597625
    Head Tube Angle69.0°69.0°69.0°
    Head Tube Length100120150
    Seat Tube Length356432508
    BB Drop555555
    Wheelbase153215631590
    Chainstay Length875875875
    Top Tube Length, Actual584598617.3
    Top Tube Length, Effective590620645
    Seat Tube Angle72.5°72.5°72.5°
    Standover Height746792841
    Stem Length607080
    Stem Angle
    Handlebar Width750800800
    Crank Length170175175
    Fork Length468468468
    Fork Rake474747
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