Surly BIG FAT DUMMY - 29"+ Long Tail Cargo Frame Set - thorfrost white

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Description of Surly BIG FAT DUMMY - 29"+ Long Tail Cargo Frame Set - thorfrost white

The pack mule for a lot of freight.


The Big Fat Dummy is a long tail cargo bike that took a few too many doses of growth hormones. At first glance, you might say that we just put bigger tires on a Big Dummy. But if you said that, you’d actually be very wrong so just… don’t. Think of Big Fat Dummy as more of a second or third cousin to Big Dummy rather than a brother. They share some of the same DNA and look sort of similar, but they’re two very different bikes and really only interact when they both reach for the potato salad spoon at that family reunion that no one really wants to be at anyway.



Now that that’s out of the way, let’s get down to the nitty gritty of what makes this hulking beast of a bike tick. Surly's 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 svelt cousin giving it a nice, predictable, and stable ride. Surly 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 10 mm or 12 mm axles in the rear with a spacing of 190/197 mm. That big ‘ol spacing equates to one thing: tire clearance for days. Big Fat Dummy maxes out at a massive 29x3.0” tire.* It uses the same 100 mm suspension-corrected fork as the Wednesday, meaning if you want to add a little squishy squishy to your ride, you can throw a Bluto on and let ‘er rip.

If you intend to carry a passenger on your Big Fat Dummy, Surly requires use of their 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.

Big Fat Dummy is ready and willing to carry all sorts of shit — literally. It’s already in use on an organic farm in Ecuador so it’s likely that it’s hauled some form of manure by now.

Please note that the frame should be treated inside with corrosion protection before assembly.
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Fact Sheet of Surly BIG FAT DUMMY - 29"+ Long Tail Cargo Frame Set - thorfrost white

Product Name: Surly BIG FAT DUMMY - 29"+ Long Tail Cargo Frame Set - thorfrost white
Manufacturer: Surly Bikes
Item Code: SRB416462
Year: 2019
Material: 4130 CroMoly steel
for Wheel Size: 29 inches
Disc brake mount: IS2000 (51mm)
Max. tire size: 29x3.0"
Recommended front travel: 100 mm
Incl./Excl. fork: incl. Surly Wednesday | 15 x 150 mm | Tapered straight blade
Recommended headset: ZS44/28.6 upper, EC44/30 lower
Derailleur clamp diameter: 34.9 mm clamp
Seatpost diameter: 30.9 mm
Seat Clamp diameter: 33.1 mm (Surly stainless included)
Bottom Bracket type: threaded English (1.37˝ x 24t)
Case width: 100 mm
rear axle: 12 x 197 mm thru axle (included)
Changeable derailleur hanger: No
Included in delivery: Frame incl. Fork, Surly stainless steel post clamp and Dummy Rail Collars
Manufacturer page: http://www.surlybikes.com/
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