Big Dummy is a long-tail cargo bike, which means that not only can you haul a serious amount of cargo, different accessories can be added to your Big Dummy frame and deck depending on what you want to carry. Being a dedicated single-piece frame, instead of an add-on to an existing bike, it’s stiffer and resistant to torsional flex, which provides a better ride and longer lasting frame than long-tail add-ons.
It’s made of Surly's size specific, 4130 CroMoly steel – a tube set engineered for cargo that sports lots of little touches that you’ve come to love in a Surly like clearance for big tires and the use of common component sizes. Figure on being able to carry about 200 pounds (90kg) of cargo. The load weight, and how it’s loaded, will affect the handling somewhat. Also, plan on using gears, especially as cargo weight increases.
If you intend to carry a passenger on your Big Dummy, Surly requires use of our Dummy Rail Collars. These provide a secondary retention system for the rack, as well as stiffen the rack system.
If you are planning to carry a child on your Big Dummy, Surly recommends the use of a child seat and has tested the Maxxi Yepp seat. They make an adaptor that that allows their seat to mount onto the deck. It works well with the Big Dummy. At this time other child seats are not recommended and will void your warranty.
Note: keep in mind Big Dummy weight limits when carrying a passenger.
Surly Big Dummy, Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded cargo specific engineered for stiffness.
Surly Big Dummy, TIG-welded 4130 CroMoly, tapered and butted straight bladewith single fender eyelet on the dropout, 1-1/8˝ x 260mm threadless steerer, 51mm IS disc mount, removable cantilever pivots, line/housing guides
Surly Stainless, 30mm Surly stainless, included
FC Firex C3.1,
Shimano Deore, FD-T611-3
SRAM GX, 10-speed TYPE 2.1
Cog or Cassette
Microshift CS-H100 10-speed, 11-36t
Cane Creek 40,
Avid BB7, Centerline 180mm rotors front & rear
WTB Volt Sport,
Shimano Deore M525 Disc, 36h. 100mm, black w/QR
Shimano Deore M525 Disc, 36h. 135mm, black w/QR
Kenda 26x2.3" Kiniption, 60tpi
Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded cargo specific engineered for stiffness and durability
Vertical, 135mm spaced with fender eyelets; Rohloff compliant
51mm disc mounts and removable cantilever pivots
Quad water bottle mounts, Surly Trip Guides for continuous brake/shift housing or brake hydraulic line (toptube and seatstay routing), fender eyelets
Seatpost clamp diameter
Front derailleur clamp diameter
28.6mm (1-1/8˝) clamp diameter, top-pull style
Bottom bracket shell
68mm wide, threaded English 1.37˝ x 24t
No frame limitations. Use whatever you want
26 x 2.5˝ with fenders
TIG-welded 4130 CroMoly, tapered and butted straight blade with single fender eyelet on the dropout, 1-1/8˝ x 260mm threadless steerer, 51mm IS disc mount, removable cantilever pivots, line/housing guides
Soil Ant Green
Cargo Weight Limit
400 lb combined rider and cargo. Max cargo 200 lb