Surly Big Dummy Cargo frameset

Surly Big Dummy frameset - The ultimate longtail cargo bike chassis

The Surly Big Dummy frameset is the robust basis for a real longtail cargo bike that has been inspiring families, commuters and entrepreneurs worldwide since 2008. Whether as a car replacement, modern "mini-van" or reliable cargo bike for everyday life 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 rigid steel frame, compatibility for human passengers (with dummy rail collars) and the ability to transport almost anything, this frameset is the perfect basis for your customised cargo project.

Sizes: S,M,L

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

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

Delivery date: April-May :The current delivery date is expected to be in April-May.

For punctual and binding delivery dates, we recommend contacting us directly in advance.

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 triangle: 10 x 135 mm, vertical dropouts, fender eyelets

- Brake mount: 51 mm IS, rotor 160-203 mm

- Bottom bracket: 73 mm BSA

- Seat tube: Ø30.9 mm, dropper compatible

- Bottle cage:

- 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 carrier mounts (top, bottom, mid-blade)

- Mudguard mounts

🌍 Areas of application

- Family cargo bike

- Car replacement in everyday life

- Commercial use (courier, delivery service, trade)

- Bulk shopping, transport, commuting

- Customised cargo superstructures

Highlights & advantages

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

- 400-lb total weight limit - ideal for heavy loads, child transport or business use

- Human cargo compatible (with dummy rail collars)

- Rohloff-compatible 135 mm dropouts

- Tyre clearance for 26" x 2.5" with mudguards

- Perfect as a car replacement, for families, commuters, courier services and small businesses