Surly Big Fat Dummy Frameset
Surly
£1,800.00
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Surly
Surly Big Fat Dummy Frameset
All-Terrain, Fat Tire Trail Bike
Big Fat Dummy is truly a hulking beast of a bike. Maximalist bikepackers, those looking to make bikepacking a family affair, and those that help maintain their local trails will appreciate the Big Fat Dummy hauling abilities.
At first glance, it might just seem like a beefed-up version of Big Dummy, but that’s actually not the case. Specifically designed around fat tires, it has a longer toptube and slacker headtube offering the most stable, stiff, and predictable ride possible while hauling a lot of cargo.
- Single-piece frame increases stiffness and decreases torsional flex
- Human cargo compliant with the use of Dummy Rail Collars
- Three-pack mounts, double water bottle bosses on seattube, internal dropper post routing
- Clearance for 26" x 5.25" tires or 29” x 3.0” tires
| Frame Construction |
4130 Chromoly, Natch tubing, double-butted main triangle, trumpet flaired tubes, TIG welded, ED coated |
|---|---|
| Fork Construction |
4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated |
| Rear Dropout Configuration |
Vertical |
| Rear Hub Spacing |
12 x 197mm (Surly axle included) 10 x 190mm with Surly 10/12 Adapter Washers (not included) |
| Front Hub Spacing |
15 x 150mm (Surly axle included) |
| Rear Brake |
Disc - 51mm I.S. (203mm max rotor) |
| Front Brake |
Disc - 51mm I.S. (203mm max rotor) |
| Head Tube |
Ø44mm |
| Steerer Tube |
Ø28.6mm (1-1/8") |
| Crown Race |
Ø30mm (1-1/8") |
| Stock Headset Upper (S.H.I.S.) |
ZS44/28.6 |
| Stock Headset Lower (S.H.I.S.) |
EC44/30 |
| Seat Collar |
Ø33.1mm |
| Seatpost |
Ø30.9mm |
| Front Derailleur (Clamp) |
High direct mount top-pull (Ø34.9mm) 55mm offset adapter (included) |
|---|---|
| Max Chainring (CL)[3] |
No frame limitations |
| Bottom Bracket |
100mm threaded (1.37" x 24TPI) |
| Tire Clearance Frame [1]/[2] |
26 x 5.25" 29 x 3.0" |
| Tire Clearance Fork [1] |
26 x 5.25" 29 x 3.0" |
| Rigid Fork Spec |
468 x 47mm |
| Max Suspension Fork Length [4] |
511 x 51mm (Fatbike 100mm) |
| Bottle Mounts Frame |
2 Three-Pack (S) 2 Standard + 2 Three-Pack (M - L) |
| Bottle Mounts Fork |
2 Three-Pack |
| Rack Mounts Frame |
Yes (Surly Dummy Rails) |
| Rack Mounts Fork |
Yes (upper, lower, and mid-blade threaded) |
| Fender Mounts Frame |
N/A |
| Fender Mounts Fork |
N/A |
| Other Features |
Kickstand plate Internal dropper post routing compatible |
