Japan
United States

Haulin'

Big Fat Dummy

Big Fat Dummy line art

Complete Bike Views

http://surlybikes.com/uploads/bikes/surly-big-fat-dummy-compv-BK3241-930x390.jpg
http://surlybikes.com/uploads/bikes/surly-big-fat-dummy-34r-BK3241-930x390.jpg
http://surlybikes.com/uploads/bikes/surly-big-fat-dummy-34f-BK3241-930x390.jpg

Frame & Detail Views

http://surlybikes.com/uploads/bikes/surly-bfd-fm-930x390.jpg

Complete & Frame

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
ZS44/28.6 upper, EC44/30 lower

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

Thru Axle
HU0139 Surly 15x150 Front Thru Axle
HU0136 Surly 12x197 Rear Thru Axle

Color
Cromwell Green