Bombtrack Hook EXT Carbon Gravel/Adventure Bike (Gloss Dark Green) (27.5") (XS)

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Some riders may live for long days out on the open road, however there are also those that know true joy comes where the pavement ends. The Bombtrack Hook EXT C is designed for riders that seek out the roughest, rowdiest, back-country roads and trails that they can find. With 27.5" wheels that features wide 2" tires, the Hook handles superbly off-road closely mimicking the agility of a hardtail mountain bike while remaining insanely agile and smooth on the tarmac. Integrate rack & fender mounts precisely located over the frame, provide riders with storage solutions for longer adventures or bikepacking. Throw your leg over this beauty, but beware, we almost guarantee you'll be hook-d on it.


  • Full carbon frame that is compatible with internally routed dropper post
  • Full carbon tapered fork with triple cage mounts and internally routed dynamo hub compatible
  • Sram Rival 1 groupset provides a wide range of gearing with the simplicity of a 1x system
  • Bombtrack Lyer alloy forged crankset with direct mount 38T chainring (Sram DM Compatible)
  • Flat mount hydraulic brakes provide consistent and powerful braking performance
  • Tubeless Hunt Adventure Sport 27.5" wheelset with WTB Venture tires (27.5 x 2.0")
  • Top tube bag mounts, triple cage mounts on downtube and seat tube, cage mounts under the downtube, and rear rack/fender mounts

Frame: Toray T700/T800 Hi-Mod Carbon w/ Rack & Fender Mounts
Fork: Full Carbon w/ Triple Cage Mounts
Handlebar: Bombtrack CX-10 Drop Bar (31.8mm) (10° Flare)
Grips/Tape: Bombtrack Escape Tape
Stem: Bombtrack Raom Forged Aluminum 
Headset: Sealed Integrated (1-1/2" - 1-1/8")
Levers: Sram Rival 1 Double Tap (Hydro) 
Shifter: Sram Rival 1 (1 x 11sp)
Brakes: Sram Rival Flat Mount Hydraulic Disc (160mm)
Crankset: Bombtrack Lyer Forged Aluminum (Sram DM) (30mm Spindle) 
BB: Bombtrack T47 (Sealed) 
Pedals: -
Chain: KMC X11 (114 Links)
Chainring: CNC Machined Aluminum (38T)
Cassette: Sram XG-1150 (10-42T)
Front Derailleur: -
Rear Derailleur: Sram Rival 1 (Long Cage) (11sp)
Front Hub: Hunt Adventure Sport (Centerlock) (12 x 100mm)
Rear Hub: Hunt Adventure Sport (Centerlock) (12 x 142mm) (Sram XD)
Rims: Hunt Adventure Sport (Double Wall) (28H)
Saddle: Bombtrack Comp Saddle
Seatpost: Bombtrack Yew (27.2mm) (300mm)
Seat Clamp: Bombtrack Prime (31.8)
Front Tire: WTB Venture TCS Light (27.5 x 2.0")
Rear Tire: WTB Venture TCS Light (27.5 x 2.0") 

*Note: These bikes are fully built by our expert bike builders, then partially disassembled as needed for shipping. Bikes will arrive to you with some basic assembly still required. 

This product was added to our catalog on June 28, 2022

Sizing Recommendations for Riders Who Fall Between Sizes:

  • Sizing down will provide a more maneuverable ride while sizing up will provide more stability
Rider Height (Feet)Rider Height (CM)
XS5'1" - 5'4"155 - 163cm
S5'4" - 5'7"163 - 170cm
M5'7" - 5'10"170 - 178cm
L5'10" - 6'1"178 - 185cm
XL6'1" - 6'4"185 - 193cm

Note: All sizing recommendations are provided by the manufacturer and may differ for each rider.



Wheel Size27.5"27.5"27.5"27.5"27.5"
Seat Tube Length490.0mm520.0mm540.0mm560.0mm580.0mm
Horizontal TT Length520.0mm535.0mm550.0mm565.0mm580.0mm
Seat Tube Angle74.5°74.0°73.0°73.0°73.0°
Head Tube Angle70.5°71.0°71.5°72.0°72.0°
Head Tube Length120.0mm140.0mm150.0mm170.0mm190.0mm
BB Drop67.0mm67.0mm67.0mm67.0mm67.0mm
Chainstay Length435.0mm435.0mm435.0mm435.0mm435.0mm
Fork Offset48.0mm48.0mm48.0mm48.0mm48.0mm
Wheelbase Length1018.0mm1025.0mm1025.0mm1035.0mm1050.0mm
Standover Height759.0mm783.0mm798.0mm818.0mm837.0mm
Front Center592.0mm599.0mm601.0mm609.0mm624.0mm
Axle to Crown398.0mm398.0mm398.0mm398.0mm398.0mm


Handlebar typeDropbarDropbarDropbarDropbarDropbar
Width (Drops)400mm420mm420mm440mm440mm
Width (Bar Ends)446mm466mm466mm486mm486mm

Note: All measurements are provided by the manufacturer and may vary depending on how measurements are acquired.