Surly Big Fat Dummy frameset 29+ thorfrost white

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

    All-Terrain, Fat Tire Trail Bike

    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.

    Frameset only!

    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: Surly 4130 Chromoly steel
    • Fork: Surly Wednesday, Tapered straight blade 4130 Chromoly
    • Seatpost: Clamp 33.1mm (Surly stainless included)


    Reach 408 432 448
    Stack 578 597 625
    Head Tube Angle 69.0° 69.0° 69.0°
    Head Tube Length 100 120 150
    Seat Tube Length 356 432 508
    BB Drop 55 55 55
    Wheelbase 1532 1563 1590
    Chainstay Length 875 875 875
    Top Tube Length, Actual 584 598 617.3
    Top Tube Length, Effective 590 620 645
    Seat Tube Angle 72.5° 72.5° 72.5°
    Standover Height 746 792 841
    Fork Length 468 468 468
    Fork Rake 47 47 47
    NOTE: The Big Fat Dummy is only available in three sizes, which is a departure from our normal way. Here’s the thing, its sizing and fit is a little different than other bikes. By using shorter seat tubes with a longer seatpost, two people of different heights can ride the same size frame. We found it works pretty well – hell the Large size even fits Sov. And nothing fits Sov.

    • 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")
    • Headset Upper (S.H.I.S.): ZS44/28.6
    • Headset Lower (S.H.I.S.): EC44/30
    • Seat Collar: Ø33.1mm
    • Seatpost: Ø30.9mm
    • Bottom Bracket: 100mm threaded (1.37" x 24TPI)
    • Tire Clearance Frame: 29 x 3.0"
    • Tire Clearance Fork: 29 x 3.0"
    • Rigid Fork Spec: 468 x 47mm
    • Max Suspension Fork Length: 511 x 51mm (Fatbike 100mm)
    • Bottle Mounts Frame: 2 Three-Pack (S), 2 Standard + 2 Three-Pack (M L)
    • Bottle Mounts Fork: 2 Three-Pack
    • Rack Mounts Frame: Yes (Surly Dummy Rails)
    • Rack Mounts Fork: Yes (upper, lower, and mid-blade threaded)
    • Fender Mounts Frame: N/A
    • Fender Mounts Fork: N/A
    • Other Features: Kickstand plate, Internal dropper post routing compatible
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