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Surly: Big Fat Dummy - 2017

Surly

$2,950.00
Condition:
New
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Product Description

Surly: Big Fat Dummy - 2017

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 Surly 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. We 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. That big ‘ol spacing equates to one thing: tire clearance for days. Big Fat Dummy maxes out at a massive 26 x 5.25” tire.* While that large of a tire provides the most traction and stability a bike can possibly offer, it’s also a lot of rubber to push and might not be for everybody. Luckily, Big Fat Dummy is also a blast to ride with 3” tires too. It uses the same 100mm 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 Surly's 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.

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.

*Using a 26 x 5.25” tire will cause some drivetrain limitations.

 

SPECIFICATIONS

Complete bike spec subject to change

Frameset

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

Fork
Surly Wednesday, Tapered straight blade 4130 CroMoly. 468mm axle to crown, 47mm offset. 51mm I.S. front standard disc mount, 150mm x 15mm thru-axle dropouts (axle included), 100mm suspension fork compatible

Seatpost Clamp
33.1mm (Surly stainless included)

Drivetrain

Crankset
Race Face Aeffect 36/22

Bottom Bracket
Race Face

Front derailleur
SRAM GX 2x11 high direct mount

Rear derailleur
SRAM GX 2x11 long cage type 2.1

Cog or cogset
Sunrace 11s 11/42

Chain
KMC X11 anti rust

Components

headset
Cane Creek 40 series

Brakes
SRAM Level T

Brake levers
SRAM Level T

Shifters
SRAM GX 2x11

Stem
H.L. 31.8mm clamp 4-bolt

Handlebar
Answer ProTaper

Saddle
WTB Volt

Seatpost
H.L. 9mm offset 2 bolt

Wheels

Front hub
Salsa 150x15 32h

Rear hub
Salsa 197x12 32h

Rims
Surly My Other Brother Darryl

Tires
Surly Big Fat Larry (front), Nate (rear)

Frame Size

Stem Length

Stem Angle

Handlebar Width

Crank Length

SM

60

7

720

170

MD

70

7

780

175

LG

80

7

780

175

 

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

Rear Dropouts

Vertical, 197 x 12mm spaced, Surly thru axle included

Brake Compatibility 

51mm disc mounts

Braze-ons/extras

Upper and lower triple bottlecage mounts on downtube, Double waterbottle bosses on seatube (not included on the small frame size), Surly Trip Guides for continuous brake/shift housing or brake hydraulic line (toptube and seatstay routing), Internal dropper post routing


Seatpost diameter

30.9mm 

Seatpost clamp diameter

33.1mm (Surly stainless included)


Headset/Steerer Tube

ZS44 EC44/30 


Front Derailleur Clamp Diameter

34.9mm, direct mount included


Bottom bracket shell

100mm wide, threaded English (1.37˝ x 24t) 

Chainring Clearance

No frame limitations. Use whatever you want


Tire Clearance

26 x 5.25˝, individual tire and rim combos may require different drivetrain choices to avoid chain/tire rub 

Fork Compatibility 

Surly Wednesday, Tapered straight blade 4130 CroMoly. 468mm axle to crown, 47mm offset. 51mm I.S. front standard disc mount, 150mm x 15mm thru-axle dropouts (axle included), 100mm suspension fork compatible 

Color

Cromwell Green
 
 
 
GEOMETRY

 

SM

MD

LG

 

Seat Tube Length

(Center-Top)

356

432

508

 

Top Tube Length

(Center-Center)

581

598

617.3

 

Effective Top Tube Length

(Center-Center)

590

620

645

 

Head Tube Angle

69.0

69.0

69.0

 

Seat Tube Angle

72.5

72.5

72.5

 

BB Drop

55

55

55

 

Chainstay Length

875

875

875

 

Wheelbase

1532

1563

1590

 

Standover Height

740

790

840

 

Head Tube Length

90

120

150

 

Fork Length

468

468

468

 

Fork Offset

47

47

47

 

Stack

569

597

625

 

Reach

411

432

448

 

NOTE: The Big Fat Dummy is only available in three sizes, which is a departure from our normal way. Here’s the thing, its sizing and fit is a little different than other bikes. By using shorter seat tubes with a longer seatpost, two people of different heights can ride the same size frame. We found it works pretty well – hell the Large size even fits Sov. And nothing fits Sov.

 

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