Surly Big Dummy Cargo Frame Set Matteo

Surly Big Dummy Frame Set – The ultimate longtail cargo bike chassis

The Surly Big Dummy frame set is the robust foundation for a genuine longtail cargo bike that has been delighting families, commuters and business owners worldwide since 2008. Whether as a car alternative, a modern ‘minivan’ or a reliable cargo bike for everyday use and business – the Big Dummy impresses with its stability, versatility and an impressive payload of up to 400 lb (rider + cargo).

With its one-piece, extremely stiff steel frame, compatibility for human passengers (with Dummy Rail Collars) and the ability to carry almost anything, this frameset is the perfect foundation for your own custom cargo project.

Sizes: M

Colour: Twilight Zone (matt black steel) (photo for illustrative purposes only)

Twilight Zone is a very dark, almost black neutral shade with a hint of cool grey. The colour code is HEX #343435, i.e. an extremely dark graphite/anthracite grey

Technical specifications (frame & fork)

Frame

• Material: 100% Surly Chromoly Steel, Natch Tubing, double-butted, TIG-welded

• Wheel sizes:

• Standard: 26 x 2.3"

• Alternative: 27.5 x 1.5–2.0", 700c x 28–32 mm (with/without mudguards)

• Rear end: 10 x 135 mm, vertical dropouts, mudguard eyelets

• Brake mount: 51 mm IS, 160–203 mm rotor

• Bottom bracket: 73 mm BSA

• Seat tube: Ø30.9 mm, dropper seatpost-compatible

• Bottle cage mounts:

• S: 2 standard + 1 three-pack

• M/L: 3 standard + 1 three-pack

Fork

• Material: 100% Surly Chromoly Steel, Natch Tubing

• Length: 420 mm, offset: 43 mm

• Brake mount: 51 mm IS, 160–203 mm

• Axle standard: 10 x 100 mm

• Mounting points:

• Four Three-Pack

• Luggage rack mounts (top, bottom, mid-blade)

• Mudguard mounts

🌍 Areas of use

• Family cargo bike

• Everyday alternative to a car

• Commercial use (courier, delivery service, trades)

• Bulk shopping, transport, commuting

• Customised cargo bodies

Highlights & benefits

• One-piece longtail steel frame for maximum rigidity and minimised torsion

• 400 lb total weight limit – ideal for heavy loads, transporting children or business use

• Human-cargo compatible (with Dummy Rail Collars)

• Rohloff-compatible 135 mm dropouts

• Tyre clearance for 26" x 2.5" tyres with mudguards

• Perfect as a car alternative, for families, commuters, courier services and small businesses

Parts offer:

Offer – Surly Big Dummy (components)

Brakes – Magura eSTOP system
Magura MT5 – front + rearMagura MDR‑P 180 mm rotor – 2 piecesMagura MDR‑P 180 mm rotor (203 mm – currently unavailable)Magura 8.S Sport – 2 pairsMagura MTE Switches – 2 pieces

Wheels – DT Swiss Heavy Duty Cargo Wheelset
DT Swiss H552 rims 26" – 2 piecesDT Swiss 350 Hybrid Classic – rear wheelDT Swiss RWS Thru-Bolt 10×135 mmDT Swiss 350 Hybrid Classic – front wheelDT Swiss Alpine III – spoke setSchwalbe Pick-Up 26 × 2.35 – 2 pieces

Handling, comfort, saddle area
Cane Creek 40 EC34 headset Surly Sunrise Bar (August September) MTB/DH stem 40–50 mm by.schulz G.2 ST 30.9 mm Selle Royal Lookin saddle Hope/Salsa saddle clamp 33.1 mm (Sizes: 30.0, 32.0, 35.0, 35.4 mm September)

Complete set – parts: €2,099

Assembly instructions
All components are supplied fully prepared for assembly – brake hoses are cut to length as required and the system is properly bled.