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> Bicycling Catalog > Bikes > Mountain > Fat Bikes > Cogburn > Cogburn Outdoors CB4
Cogburn Cogburn Outdoors CB4

Cogburn Cogburn Outdoors CB4

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  • This item is not permitted to be shipped, however it can be purchased online and picked up, from our shop, at your convenience.

Product Details

Cogburn Cogburn Outdoors CB4

This is the CB4. CB4 is a fatbike, a human powered all-terrain vehicle built to take hunters, anglers and foragers quickly and quietly further into the backcountry. Its massive 3.8”-wide tires run at very low pressure to provide flotation and amazing traction over rough or soft terrain.

The frame and fork receive a tough RealTree Xtra® camouflage finish and the components are anodized black and bead blasted to a no-glare finish.


CB4 is equipped with full range gearing, all-condition disc brakes and a wide handlebar for control even while loaded. The frame has attachment points for a rear rack and water or fuel bottles cages. The fork has additional attachment points to expand carrying capacity. We’re proud to say the CB4 is designed, finished and assembled in the USA.

Tested and proven Fit and Bike Handling:
The frame’s lowered top tube maximizes stand over clearance and rider comfort, making it easy to mount and dismount. The frame is engineered to ensure an efficient, responsive ride and stable handling, even at low speed.

A6N-6000 Series Aluminum Tubeset:
The frame is made of high quality heat-treated, double-butted A6N-6000AL tubing. Superior design and workmanship result in a high quality bike that is light, strong and responsive so you can go everywhere your hunts takes you.

Function-Shaped Frame:
The frame’s rear tubes maximize heel clearance while wearing boots and carrying cargo. The rear hub spacing and tube design provide clearance for fat tires without the need to ‘dish’ them outboard for tire clearance at the chain. The result is a strong wheel and a durable, efficient drivetrain.

Full Length Cable Routing:
Full length housing for brakes and shifters protects the cables to ensure they perform even in wet, muddy, dusty conditions…exactly the kind of conditions you’re likely to encounter.

Rack Mounts:
TIG-welded attachment points on the frame’s rear end allow the addition of a rack. Carrying your gear on the bike and not your back results in greater agility and less fatigue for longer hours in the field.

Bottle Mounts:
The CB4 frame has attachment points for 1, 2, or 3 standard water bottle cage mounts, depending on the space available on each frame size (larger frames have more bottle mounts, smaller ones have less). The fork has 2 sets of triple-boss attachment points, one on each leg, for oversize cages on the fork to expand carrying capacity for water, stove fuel, sleeping pads and other gear.


Front and Rear Shifters Shimano Deore 2 x 10 Speed
Front Derailleur Shimano Deore 2 x 10 Speed
Rear Derailleur Shimano Deore Shadow Plus 10 Speed
Crankset and Bottom Bracket SRAM X5 GXP100, 175mm crank with sealed bearings, 22/36t gearing
Chain KMC 10-speed
Derailleur Cable and Housing Jagwire stainless shift cables and full length housing
Cassette Shimano Deore – 10-speed, 11/36t gearing
Wheels Formula sealed-bearing hubs front and rear, Surly 82mm-wide Rolling Darryl rims, DT Swiss stainless steel spokes, Built and finished by hand in the USA
Tires and Tubes Surly Nate 26x3.8” tires, Surly Light Fat inner tubes
Front and Rear Brakeset Avid BB7 cable actuated disc brakes, 160mm stainless rotors, Avid FR5 levers
Brake Cable and Housing Jagwire stainless brake cables and full length compressionless housing
Handlebar 750mm width, 20mm rise, 11° sweepback
Grips Knurled rubber, Black
Stem Kalloy. +7° x 90 mm length, Bead-blasted finish, Black
Saddle Velo, Foam padded with vinyl cover, Black
Seatpost Kalloy, 31.6 diameter, 400mm length, Bead-blasted finish, Black
Seatclamp Kalloy, 34.9mm I.D., Bead-blasted finish
Pedals Wellgo platform type, Black
*Specification subject to change without notice

  • Part Numbers close open

    Option Store SKU
    SM/MD BK2800
    LG/XL BK2801
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43 Middlesex Turnpike 
Burlington, MA 01803
(781) 272-0870
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Cycle Loft is a proud supporter of several local, regional and national cycling advocacy organizations. These organizations are tirelessly helping to improve the quality of cycling opportunities and the health of your independent bicycle dealership network. We encourage you to visit their sites to learn more.

Eastern Fat Tire Association
International Mountain Bike Association
League of American Bicyclists
Lexington Farmers’ Market
Light Electric Vehicle Association

National Bicycle Dealers Association
New England Mountain Bike Association
People for Bikes
USA Cycling
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