Bombtrack Bicycle Company Bombtrack Hook EXT

"As capable on backcountry campouts as it is on post-work blasts, the Hook EXT remains the choice when you’re unsure of the terrain, but know you want to have fun riding it."
Introducing the Hook EXT
The Hook’s hoodlum tendencies given free rein. Using a Columbus steel frame, dedicated carbon fork, and lively 27.5-inch wheels, the EXT can batter through territory out-of-bounds to other drop handlebar bikes. Backed by Sram’s 1 x 11 Rival groupset, this provides both the gearing range and braking power needed for extreme riding. Adding more build options, this year sees the addition of an integrated rear light mount. As capable on backcountry campouts as it is on post-work blasts, the Hook EXT remains the choice when you’re unsure of the terrain, but know you want to have fun riding it.

* Columbus Cromor double butted frame with rear light mount.
* Full carbon tapered fork with internal light cable routing, through axles and triple cage mounts.
* Hydraulic Sram Rival 1 x 11 groupset and brakes.
* Bombtrack Lyer 30 mm alluminium crank with 40 T direct mount chainring.
* Bombtrack Tau 12 mm through axle hubs.
* KMC X11 EPT Anti Rust Chain.
* Wide rims for improved tire performance.
* Toptube bag direct mounts, triple cage mount on downtube and seattube for optimized bottle position, bottle cage mounts underneath the downtube and rear rack mounts.
Color 1 Matt Metallic Grey Blue
Color 2 -
Frame COLUMBUS CROMOR double butted tubing, TA,rack / fender mounts, internal light cable routing, rear light mount, 86.5 mm T47 BB shell
Fork Full carbon, TA, 1.1/2'' - 1.1/8'', fender / triple cage mounts, internal hub dynamo cable routing
Handlebar BOMBTRACK CX-10 drop bar, 31.8 mm, 10° flare
Grips BOMBTRACK ESCAPE bar tape
Stem BOMBTRACK ROAM forged aluminium stem, -7°
Headset Sealed external aheadset, 1.1/2'' - 1.1/8''
Levers SRAM RIVAL 1 double tap hydraulic
Shifter SRAM RIVAL 1 double tap 1 x 11
Brakes SRAM RIVAL flat mount hydraulic disc brakes with 160 mm rotors
Crankset BOMBTRACK LYER forged aluminium crank, direct mount interface (SRAM compatible), 30 mm spindle
BB BOMBTRACK T47 internal sealed BB for 30 mm spindle
Pedals -
Chain KMC X11 EPT Anti Rust chain, 1/2'' x 11/128'', 114L
Chainring CNC machined aluminium, narrow-wide, 40 T
Cassette SRAM PG-1130 11-speed cassette, 11 - 42 T
Front derailleur -
Rear derailleur SRAM RIVAL 1, clutch, long cage
Front hub BOMBTRACK TAU sealed disc hub, 12 x 100 mm thru-axle
Rear hub BOMBTRACK TAU sealed disc hub, 11-speed, 12 x 142 mm thru-axle
Front rim WTB ST Light i25 double wall, TCS 2.0, 32h
Rear rim WTB ST Light i23 double wall, TCS 2.0, 32h
Saddle BOMBTRACK COMP saddle
Seat post BOMBTRACK YEW aluminium seatpost, 27.2 mm x 300 mm
Seat clamp BOMBTRACK ORIGIN forged aluminium seat clamp, 29.8 mm
Front tire WTB RANGER TCS LIGHT / FAST ROLLING 27.5'' x 2.0'', tubeless ready
Rear tire WTB RANGER TCS LIGHT / FAST ROLLING 27.5'' x 2.0'', tubeless ready
Fender -
Rack -
Light -
Weight 11.2 kg (size M)
Weight frameset tba (size M, including TA, bolts, seatclamp, hanger)
Maximum rider weight 130 kg incl. luggage
ASTM riding condition 2


BB Standard T47 - 86.5 mm shell width
Headset Standard (S.H.I.S.) EC34 / 28.6 | EC44 / 40
Fork Max Tire Clearance w/o fender 650B x 52C / 700C x 45C
Frame Max Tire Clearance w/o fender 650B x 52C / 700C x 40C
Maximum chainring clearance 1x 44 T with 45 mm chainline
Maximum chainring clearance 2x 50 / 36 T with 45 mm chainline
Seat Post Diameter 27.2 mm
Seat clamp diameter 29.8 mm
Brake mount front FM
Brake mount rear FM
Maximum rotor clearance front 160 mm
Maximum rotor clearance rear 160 mm
Front through axle 12 mm x 100 mm, 1.5 TPI
Rear through axle 12 mm x 142 mm, 1.5 TPI
Derailleur hanger BT-DH-008
ISO testing standard Road
Crankarm XS 165 mm / S - M 170 mm / L - XL 175 mm
Q Factor 152 mm
BCD crank direct mount (Sram compatible)
Chainline 45 mm
Spoke length front wheel tba
Spoke length rear wheel tba
Spoke count (front / rear) 32 / 32
ERD 570 mm
Front hub PCD 58 mm
Rear hub PCD 58 mm
Stem Length XS - S 80 mm / M 90 mm / L - XL 100 mm
Stem angle -7°
Headset Spacers 1 x 10 mm, 2 x 5 mm
Seat post offset 0 mm
Seat post length 300
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