Skip to main content.
Bikes. Parts. Chaos.

Big Dummy is a long-tail cargo bike that expands what’s possible by bike.

Take Your Longtail Bike Anywhere

Since its introduction in 2008, many a family have ditched one or both of their cars thanks to Big Dummy. We’ve also seen many entrepreneurs and small business owners minimize their carbon footprint and incorporate Big Dummy into their business model.

Big Dummy is the ultimate grocery getter, the modern day mini-van, the company car, and a human-powered car replacement. It’s all those things and more in that there’s no limit to what it can haul — as long as it falls within the 400-pound weight limit.

  • Dedicated single-piece frame increases stiffness and decreases torsional flex
  • Human cargo compliant with the use of Dummy Rail Collars
  • Vertical, 135mm spaced dropouts with fender eyelets; Rohloff compliant
  • Clearance for 26" x 2.5" tires with fenders

Bike Capabilities

  • 5/5 with Car Replacement Car Replacement: 5 out of 5
  • 5/5 with Passengers Passengers: 5 out of 5
  • 3/5 with Off Road Off Road: 3 out of 5
  • 5/5 with Trailer Compatibility Trailer Compatibility: 5 out of 5

NOTE: You can ride your bike wherever the hell you want, but this is what we think this bike is best at.

Big Dummy Long-Tail Cargo Bike with Child
Big Dummy Carries Anything
Big Dummy Rear View
Big Dummy Rear Tire
Big Dummy by the Tracks
Big Dummy at Pike Place Market

#bigdummy Image Dump

Tag your Instagram Images with #SurlyMakeItYourOwn and your bike may show up here.

Where to Buy

Big Dummy - complete bike - Dark Side of the Maroon




Surly Big Dummy, Surly 4130 Chromoly steel. Main triangle double-butted. TIG-welded cargo specific engineered for stiffness.


Surly Troll 420mm axle-to-crown x 43mm offset, tapered and butted straight blade, 4130 Chromoly. 51mm I.S. disc mount

Seatpost Clamp Surly Stainless, 30mm Surly stainless, included


Headset Cane Creek 40
Brakes Avid BB7
Brake Levers Avid FR-5
Rotors SRAM Centerline 180/180mm
Shifters X5 Trigger
Stem 4 Bolt 31.8mm clamp
Handlebar Premetec
Grip/Tape Velo Non-Locking
Saddle WTB Volt Sport
Seatpost 2 -Bolt. 27.2mm


Crankset TruVativ 48/36/26
Bottom Bracket SRAM
Front Derailleur Shimano Deore, FD-T611-3
Rear Derailleur SRAM GX Type 2.1
Cog or cogset Microshift CS-H100 10 speed, 11-36t
Chain KMC X10


Front Hub Shimano Deore M525, 36h, QR
Rear Hub Shimano Deore M525, 36h, QR
Rims Alex Adventurer
Tires Schwalbe Big Apple 26" x 60mm

Complete bike spec subject to change

Big Dummy 2014 Geometry
SIZE Small (16) Medium (18) Large (20) xLarge (22)
Reach 15.7 399.6 16.5 418.1 17.0 431.7 17.5 444.1
Stack 22.3 566.5 22.8 580.0 23.4 594.1 24.1 611.3
Head Tube Angle 72.0° 72.0° 72.0° 72.0°
Head Tube Length 5.2 131.7 5.7 145.9 6.3 160.8 7.0 178.8
Seat Tube Length 16.0 406.4 18.0 457.2 20.0 508.0 22.0 558.8
BB Drop 1.6 40.0 1.6 40.0 1.6 40.0 1.6 40.0
Wheelbase 56.5 1435.9 57.4 1458.8 58.1 1477.0 58.9 1495.0
Chainstay Length 32.6 827.0 32.6 827.0 32.6 827.0 32.6 827.0
Top Tube Length, Actual 21.7 550.6 22.4 570.1 23.2 588.7 24.0 609.6
Top Tube Length, Effective 22.6 573.5 23.5 596.1 24.2 614.1 24.9 631.8
Seat Tube Angle 73.0° 73.0° 73.0° 73.0°
Standover Height 29.1 740.4 30.4 771.5 31.6 802.9 32.9 835.8
Stem Length 3.1 80 3.5 90 3.9 100 4.3 110
Stem Angle
Handlebar Width 27.6 700 29.5 750 29.5 750 29.5 750
Crank Length 6.7 170 6.9 175 6.9 175 6.9 175
Fork Length 16.5 420 16.5 420 16.5 420 16.5 420
Fork Rake 1.7 43.0 1.7 43.0 1.7 43.0 1.7 43.0

All dimensions are preliminary and subject to change * Standover is measured from the top of the TT, at the center, with a tire measuring approximately Ø676mm

Frame Construction

4130 Chromoly, Natch tubing, double-butted main triangle, TIG welded

Fork Construction

4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated

Rear Dropout Configuration


Rear Hub Spacing

10 x 135mm

Front Hub Spacing

10 x 100mm

Rear Brake

Disc - 51mm I.S. (203mm max rotor)

Rim - Canti (removable posts)

Front Brake

Disc - 51mm I.S. (203mm max rotor)

Rim - Canti (removable posts)

Head Tube


Steerer Tube

Ø28.6mm (1-1/8")

Crown Race

Ø30mm (1-1/8")

Stock Headset Upper (S.H.I.S.)


Stock Headset Lower (S.H.I.S.)


Seat Collar




Front Derailleur (Clamp)

Top-pull (Ø28.6mm)

Max Chainring (CL)[3]

No frame limitations

Bottom Bracket

68mm threaded (1.37" x 24TPI)

Tire Clearance Frame [1]/[2]

26 x 2.5" (w/ fenders)

Tire Clearance Fork [1]

26 x 3.0"

Rigid Fork Spec

420 x 43mm

Max Suspension Fork Length [4]


Bottle Mounts Frame

4 Standard

Bottle Mounts Fork

4 Three-Pack

Rack Mounts Frame

Yes (Surly Dummy Rails)

Rack Mounts Fork

Yes (upper, lower, and mid-blade threaded)

Fender Mounts Frame


Fender Mounts Fork


Other Features

Kickstand plate

Dedicated Rohloff cable routing and mount for OEM 2 axle plate

[1] Different tire and rim combinations will result in different clearances.  
[2] Depending on drivetrain configuration, tire clearance may be limited by the chain and not frame.
[3] Listed chainring clearance is worst case scenario.  Clearances vary widely depending on components and configurations.
[4] Suspension fork length listed at full extension (not at sag) 

FAQ & Reviews


Frame Warranty


This Surly product is warranted against defects in materials and workmanship for three years from the date of retail purchase of the product, subject to the limitations detailed below. Save your dated receipt for proof of purchase.

This warranty does NOT cover the following:

  • Damage due to improper assembly or follow-up maintenance or lack of skill, competence or experience of the user or assembler
  • Products that have been modified, neglected, used in competition or for commercial purposes, misused or abused, involved in accidents or anything other than normal use
  • Installation of components, parts or accessories not originally intended for or compatible with bicycle as sold
  • Damage or deterioration to the paint, surface finish, aesthetics or appearance of the product
  • Normal wear and tear
  • Labor required to remove and/or refit and re-adjust the product within the bicycle assembly

This limited warranty is expressly limited to the repair or replacement of a defective product, at the option of Surly, and is the sole remedy of the warranty. This limited warranty applies only to the original purchaser of the Surly product and is not transferrable. This warranty applies only to products purchased through an authorized dealer or distributor. In no event shall Surly be liable for any loss, inconvenience or damage, whether direct, incidental, consequential, or otherwise resulting from breach of any express or implied warranty or condition, of merchantability, fitness for a particular purpose, or otherwise with respect to our products except as set forth herein.

This limited warranty gives the consumer specific legal rights, and those rights and other rights may vary from place to place. This limited warranty does not affect your statutory rights.