SURLY Big Fat Dummy Green*Clearance Product
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The Big Fat Dummy is a long tail, fat tyre cargo bike you can use for shopping, collecting wood, delivering stuff, or prepping for Brexit
The goal with designing a cargo bike around fat tires was to create the most stable, stiff, and traction-laden ride possible while hauling a ton of stuff. Big Fat Dummy has a longer toptube and slacker headtube than its more svelte cousin giving it a nice, predictable, and stable ride. Surly have also used thinner, lighter tubing to construct its cargo area so while it's an overall burlier bike, there's not much difference in weight.
Big Fat Dummy accepts either 10mm or 12mm axles in the rear with a spacing of 190/197mm. Big Fat Dummy has masses of tyre clearance and you can run anything from a 3" speed demon to a 5" rumble monster
If you intend to carry a passenger on your Big Fat Dummy, it requires use of Surly Dummy Rail Collars. These provide a secondary retention system for the rack, as well as stiffen the rack system. 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. All Big Fat Dummy framesets and bikes ship with a Dummy deck, rails, bags, and the aforementioned Dummy Rail Collars so you can immediately start hauling cargo - human or otherwise.
For all the nuts and bolts of compatibility read Surly's Blog on the subject