There is no doubting that the 2013 Surly Pugsley Fat Bike Frame was created to go where standard 'all terrain' bikes flounder. The floatation and traction afforded by large-volume, low-pressure tires can get you over and through otherwise unrideable terrain, such as sand, mud, wet rocks and roots, ice, and many kinds of snow. Wide, low-pressure tires are easier than standard tires on whatever terrain you pass over because they don't dig in as easily.
The Pugsley frame has horizontal rear dropouts with a derailleur hanger. You can set it up with derailleurs or an internally geared hub, or set it up as a singlespeed or fixed-gear. This isn't just a nice option. In certain situations, extra weight and the potential for a complex part to fail isn't just a pain; it can be deadly serious business. The stock fork accepts a 135mm rear mountain hub, just like the frame. This makes it easier to install and remove the wheel (a big tire on a big rim benefits from a wide opening), but more to the point also allows front and rear wheel interchangeability. This means you can have another full gear cluster, a singlespeed or a fixed-gear wheel option should something go wrong with your freehub body or derailleurs. In other words, it's one more option for getting you back out from whatever situation you've gotten yourself into.
- Surly 4130 CroMoly steel; main triangle double-butted; horizontal rear-load dropouts with derailleur hanger
- Frame and fork dropouts are spaced at 135mm and offset 17.5mm to the drive side to compliment a 100mm bottom bracket shell and the resulting wider chainline. Equal spacing and offset of the fork and frame allow front and rear wheels to interchange
- Clears a 26 x 3.8 inch tire on 82mm rims. Use of 82mm rims requires a Surly Mr. Whirly Offset Double (MWOD) crank or truncated cassette to avoid tire/chain rub. Standard mountain triple gearing will work with 65mm rims, 22-32-44t Max
- Dual water bottle mounts, Surly Trip Guide full line guides for brake and derailleurs, fender and rack eyelets
- Uses an E-type front derailleur
| Tubing | Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded |
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| Rear dropouts | Surly horizontal rear load, with derailleur hanger; 135mm O.L.D.; offset 17.5mm |
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| Brake compatibility | 51mm IS disc mounts frame and fork. NOTE: USE REAR CALIPER ADAPTERS FOR BOTH FRONT AND REAR BRAKES! |
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| Braze-ons | Dual water bottle mounts, Surly Trip Guide full line guides for brake and derailleurs, fender and rack eyelets |
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| Seatpost diameter | 27.2mm |
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| Seatpost clamp | 30.0mm (Surly stainless included) |
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| Front derailleur clamp | E-type |
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| Bottom bracket shell | 100mm wide, standard English threading (1.37 inch x 24t) |
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| Chainring clearance | Compact triple: 22-32-44t (with 65mm rim) |
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| Tire clearance | 3.8 inch on 82mm rims. Use of 82mm rims requires the use of Surly Mr. Whirly Offset Double crank or truncated cassette to avoid tire/chain rub. Standard mountain triple gearing will work with 65mm rims |
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| Fork | 447mm axle to crown, tapered straight blade, 4130 CroMoly. 51mm IS REAR disc mount. 135mm-spaced dropouts, 17.5mm offset |
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| Headset | 1-1/8 inch threadless |
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*Specifications are subject to change without notice