Bombtrack Hook EXT Gravel/Adventure Bike (Matte Metallic Grey) (27.5") (XS)

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Bombtrack Hook EXT Gravel/Adventure Bike (Matte Metallic Grey) (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 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. Integrated 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.


  • Columbus Cromor double butted frame construction with integrated rear light mount
  • 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 40T chainring (Sram DM Compatible)
  • Flat mount hydraulic brakes provide consistent and powerful braking performance
  • WTB 27.5" wheelset with WTB Ranger 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: Columbus Cromor Double Butted Tubing 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 External (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-1130 (11-42T)
Front Derailleur: -
Rear Derailleur: Sram Rival 1 (Long Cage) (11sp)
Front Hub: Bombtrack TAU (6-Bolt) (12 x 100mm)
Rear Hub: Bombtrack TAU (6-Bolt) (12 x 142mm) (11sp)
Rims: WTB ST Light i25 (Double Wall) (32H)
Saddle: Bombtrack Comp Saddle
Seatpost: Bombtrack Yew (27.2mm) (300mm)
Seat Clamp: Bombtrack Orgin (29.8mm)
Front Tire: WTB Ranger TCS Light (27.5 x 2.0")
Rear Tire: WTB Ranger 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

Mike B
Verified Owner
Friday, Nov 10 2023 (7 months ago)
Bombtrack Hook EXT Gravel/Adventure Bike (Matte Metallic Grey) (27.5") (M)
The bike itself is awesome. But, it arrived with the following issues - 1) bent derailleur hanger 2) cabled improperly (twisted and running to wrong side) 3) bent brake disc. I took it to my local shop and had everything fixed and corrected - to the cost of $215. Not ideal. Let's please do better Performance Bicycle.
Christopher Roush
Verified Owner
Friday, Feb 2 2024 (4 months ago)
Bombtrack Hook EXT Gravel/Adventure Bike (Matte Metallic Grey) (27.5") (M)
As another reviewer posted, I had the same issue of a bent derailleur hanger and bent rear brake disc, probably go knocked around in shipping. I replaced the hanger and and disc for about $50, but this was money well spent because everything else on this bike is perfect, such a well built, precise, solid, and beautiful bike. You can tell it's German engineered as it rides so well, everything performs close to perfection. I love steel bikes, this is a modern example of how good they can be (once it's sorted out), double thumbs up!
Anthony Jacang
Verified Owner
Wednesday, Dec 27 2023 (6 months ago)
Bombtrack Hook EXT Gravel/Adventure Bike (Matte Metallic Grey) (27.5") (S)
I was looking for a replacement for my 2018 Specialized Diverge for a little of both gravel and bike packing. Found this Boobtrack Hook Ext on sale at Performance Bike in California.

Great service over the phone with customer service and their tech folks answering all my questions about the bike. I couldn’t be happier with this Bombtrack Hook Ext. it checks all the boxes for me.

On top of this was free shipping. The bike arrived at my door step a few days later all intact with excellent packing.The bike was easy to put together and shifts smoothly.

Thank you Bombtrack and Performance Bike.

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)
XS4'11" - 5'3"150 - 161cm
S5'3" - 5'7"160 - 171cm
M5'7" - 5'11"170 - 181cm
L5'10" - 6'3"179 - 190cm
XL6'2" - 6'6"188 - 199cm

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 Length460.0mm500.0mm530.0mm570.0mm600.0mm
Horizontal TT Length519.0mm533.0mm556.0mm570.0mm595.0mm
Seat Tube Angle74.5°74.5°74.0°74.0°74.0°
Head Tube Angle71.5°71.5°72.0°72.0°72.0°
Head Tube Length110.0mm130.0mm150.0mm170.0mm190.0mm
BB Drop75.0mm75.0mm70.0mm70.0mm70.0mm
Chainstay Length425.0mm425.0mm425.0mm425.0mm425.0mm
Fork Offset48.0mm48.0mm48.0mm48.0mm48.0mm
Wheelbase Length995.0mm1010.0mm1025.0mm1040.0mm1060.0mm
Standover Height748.0mm776.0mm803.0mm831.0mm855.0mm
Front Center581.0mm596.0mm610.0mm625.0mm645.0mm
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.