Name: 2018 Surly Big Dummy Frameset
Brand: Surly
Rating: 4.224 (1 reviews)

51mm disc mounts and removable cantilever pivots

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

Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded cargo specific engineered for stiffness and durability

400 lb combined rider and cargo. Max cargo 200 lb

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.
Like all our frames, it’s made of our 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. This may seem obvious, but as you get comfy with it, you will use your full range of gears as never before.
The parts kit is good quality, and suitable to loaded as well as unloaded riding. It’s got a 3x10 drivetrain, Avid BB7 disc brakes, quality Shimano Deore hubs, and 26x2.3” Kenda Kiniption tires. We’ve outfitted it with our Surly-designed bags, deck, rails and Dummy Rail Collars; everything you need for the majority of stuff you might carry, like groceries, shovels, bags of charcoal or mulch, guitars, lamps, mannequins, whatever. Bags, deck, rails, and rail collars are all designed to improve on previous offerings and work together to make sure your stuff is transported with safety and stability. It’s an unbending interface, which when you’re carrying lots of cargo, is a good thing to have. Get creative, and get hauling.
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. These are included with MY17 Big Dummy bikes and frames, as well as available AM for older Big Dummy bikes and frames [compatible with all generations of Big Dummy bikes/frames]. In addition, a stoker handlebar set up, found on tandem bicycles, is recommended as well. Make sure to check with seat post manufacturer for stoker handlebar compatibility.
If you are planning to carry a child on your Big Dummy, Surly recommends the use of a child seat. We’ve tested the Maxxi Yepp seat. They make an adaptor that that allows their seat to mount onto our deck. It works well with the Big Dummy. At this time other child seats are not recommended and will void your warranty. We are testing other options. For the most up to date compatibility/options, check http://www.surlybikes.com/safety
Note: keep in mind Big Dummy weight limits when carrying a passenger.

Surly Big Dummy Frameset

A 29″ steel frame long tail cargo frameset with rim brakes.

Beast of burden that won't win any awards for agility but does its job very capably

Frame	Steel
Fork	Steel
Wheels	29″
Brakes	Rim

Frame	Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded cargo specific engineered for stiffness and durability BB Standard: BSA, 68mm, Threaded Tire Clearance: 2.5"
Fork	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
Bottom Bracket	68mm wide, threaded English 1.37˝ x 24t
Seatpost	27.2mm Type: Rigid

2018 SurlyBig Dummy Frameset

2018 Surly
Big Dummy Frameset