Over the past few years we've immensely enjoyed sharing the backcountry with you, but the time has come for Cogburn to close our doors. We would like to thank you for all of your support, and for sharing your stories and experiences with us. Please know that we will continue to support all in-field products and wish you the best in your pursuit of the outdoors.

Cogburn Outdoors - CB4

OVERVIEW

This is the CB4. CB4 is a fatbike, a human powered all-terrain vehicle built to take hunters and anglers far into the backcountry quickly and quietly. 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. Multiple finish options include Realtree Xtra®, Realtree Max4®, Realtree AP Blaze® or Forest green.

Features

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 bottle cages. The fork has additional attachment points to expand carrying capacity. We are also proud to say that the Cogburn CB4 is designed and assembled in the USA.

Tested and proven Fit and 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 results in greater agility and less fatigue in your back and feet 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 mid-blade mounts and 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.




SPECIFICATIONS
Shimano CB4 Realtree Xtra® and AP Snow

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


Realtree Xtra®

Realtree AP Snow®




SPECIFICATIONS
SRAM CB4 Realtree XTRA®, Max4, AP Blaze, Forest Green, and Kuiu Verde

Front and Rear Shifters Sram X5 trigger 2x10 Speed
Front Derailleur Sram X5 HDM Dual Pull 2 x 10 Speed
Rear Derailleur Sram X7 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 Sram 1020 – 10-speed, 11/36t gearing Black
Wheels Salsa sealed-bearing hubs front and rear, Surly 82mm-wide Holy 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 Shimano M355 Hydraulic Disc brakes
Handlebar 750mm width, 20mm rise, 11° sweepback
Headset Cane Creek 10
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 Zoom QR, 34.9mm I.D., Bead-blasted finish
Pedals Wellgo platform type, Black
*Specification subject to change without notice



Realtree Xtra®

Realtree Max4®

Realtree AP Blaze ®

Forest Green

Kuiu Verde

GEOMETRY

  SMALL LARGE
Recommended Rider Height 5'4" - 5'9" 5'10" - 6'4"
A. Top Tube Effective 23.2 24.4
B. Seat Tube Length 16.0 19.0
C. Head Tube Angle 69.5° 69.5°
D. Seat Tube Angle 73° 73°
E. BB Drop 2.6 2.6
F. Chainstay Length 18.1 18.1
G. Head Tube Length 5.1 5.9
H. Fork Length 18.4 18.4
I. Fork Offset 1.8 1.8
J. Wheel Base 43.9 45.2
Standover 26.696 29.158