Bombtrack Hook EXT 2018

Takes 'road-plus' further off the beaten track and sets the benchmark for a steel gravel bike.


Built on a 27.5” rim and using a wider tire produces a wheel with the same outer diameter as a typical 700x28c. This means it’s possible to run bigger knobby mountain bike tires, with all the grip they offer, yet retain the geometry of a CX/gravel bike, something gravel racers have long dreamed of. This is made possible thanks to a specially designed frame that utilizes a wider bottom bracket and yoke to maintain a wide yet short rear end.

The Columbus Cromor double-butted tubing has the perfect blend of being lightweight yet durable, perfect for gravel riding. For 2018 the EXT features a new full carbon fork, with anything cage and fender mounts, creating more options for front end luggage. Additional frame features added for 2018 include the invest cast chain stay yoke, dropper post compatibility and direct mounts for top tube bag.

The SRAM Rival 1 is ideally suited to the Hook EXT, thanks to its simplified 1x design with clutch derailleur, wide range cassette and X-sync chainring providing smooth shifting in any conditions. The hydraulic brakes bring a superior stopping power to the EXT, which is reassuring on steeper technical descents. The versatile build is designed to offer as much all-round use as possible, so if your journey is mainly on-road, swap out the wheels for a set of 700c’s, with anything up to 45c tire.



  • Frame updated with Bombtrack casted drive-side yoke, extra cage mount under down tube, direct mount top tube ‘fuel’ bag and stealth dropper post routing
  • Columbus Cromor, double butted front triangle chosen for its lightweight yet durable properties ideal for CX and gravel rides.
  • Straight blade extra wide full carbon fork with triple cage mounts and 12mm thru-axle
  • SRAM Rival-1 crankset with SRAM X-Sync 40T chainring and Rival-1 11-speed derailleur
  • WTB STs - i19TCS rims with WTB Nano 2.1” Race folding tires.


  • WHEEL SIZE 700c
  • COLOR Matt Metallic Grey
  • FRAME COLUMBUS "Cromor" double butted tubing, TA dropout, repl. hanger, rack & fender mounts
  • FORK BT BIKES "EXT" full carbon, TA disc fork, 1.1/8"-1.1/2" tapered, with triple cage mounts
  • HEADSET FSA "Orbit ITA" sealed a-headset, tapered 1.1/8"-1.1/2"
  • WEIGHT 11.1kg (size M)
  • CRANKSET SRAM "Rival-1"
  • BB 386 Evo - FSA PF30 with GXP adapter
  • LEVERS SRAM "Rival-1"
  • SHIFTER SRAM "Rival-1"
  • PEDALS not included
  • CHAIN KMC "X11-1"
  • CHAINRING SRAM "X-Sync" alloy, 40T
  • CASSETTE SRAM "PG-1130" 11-speed cassette, 11-42T
  • BARS BT BIKES "CX-10" 6061-T6 butted alloy, 10° flared drop bar
  • GRIPS BT BIKES "PRO" shock-proof bar tape
    STEM BT BIKES "Origin" forged alloy stem, -7°
    SADDLE SELLE SAN MARCO "Squadra-Startup" saddle
  • SEAT POST BT BIKES 'SP-DC2X' alloy seatpost
  • SEAT CLAMP BT BIKES "Origin" forged alloy seatclamp
  • FRONT HUB BT BIKES "Origin" sealed, CL disc hub, 12x100mm Thru-axle
  • REAR HUB BT BIKES "Origin" sealed hub, 11-speed, CL disc, 12x142mm Thru-axle
  • FRONT RIM WTB "STs" double wall sleeved, TLC, i19, 32h
  • REAR RIM WTB "STs" double wall sleeved, TLC, i19, 32h
  • TIRES WTB "Nano" 27.5" x 2.1" Race folding
  • BRAKES SRAM "Rival" flat mount hydraulic with 160mm F / 140mm R rotors


Product sizing: S, M, L, XL



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