BOMBTRACK Hook EXT Frameset - Metallic Sunglow Fade

The Bombtrack Hook EXT Frameset in Metallic Sunglow Fade is a steel adventure gravel platform designed for demanding terrain. A Columbus Cromor double-butted frame, dedicated Seido MGV full carbon fork and 27.5" wheels combine to carry wide tyres, gear and speed over rough tracks, singletrack and unpredictable routes where many classic gravel bikes reach their limits.

What’s included in the frameset

• Frame: Columbus Cromor double-butted steel, TA, rack/fender mounts, internal light cable routing, rear light mount, 85.5 mm T47 bottom bracket shell.
• Fork: Seido MGV full carbon, TA, 1.5" – 1 1/8" tapered steerer, fender / triple cage mounts, lowrider rack compatible, 180 mm max rotor size, internal hub dynamo cable routing.
• Headset: sealed external aheadset, 1.5" – 1 1/8".
• Thru-axles: 12 × 100 mm front / 12 × 142 mm rear (included).
• Seat clamp: Bombtrack Prime 29.8 mm (included).

Use cases & configuration options

Aggressive gravel & singletrack

With 27.5" wheels and wide tyre clearance, the Hook EXT is built to tackle rough gravel, technical trails and demanding descents. It’s a strong basis for powerful disc brakes, high-volume tyres and wide-range 1x drivetrains aimed at control and fun rather than pure racing.

Off-road bikepacking & adventure touring

Multiple mounts across frame and fork (rack, fenders, triple cage, rear light mount) make the Hook EXT an excellent choice for bikepacking and off-road touring projects. Both 1x and 2x drivetrains are possible within the declared clearances, so you can prioritise simplicity or a wider gear range depending on terrain and load.

One-bike solution for unknown terrain

If you want a single frameset to cover everything from tough commuting to remote backcountry rides, the Hook EXT is designed to shine when the route is unknown. By tuning wheels, tyres and drivetrain within the frame’s standards, you can build a very capable mixed-terrain bike.

Compatibility & build infos

• BB standard: T47 – 85.5 mm shell width.
• Headset standard (S.H.I.S.): EC34 / 28.6 (upper) | EC44 / 40 (lower).
• Crown race angle: 45°.
• Fork steerer I.D.: 23.6 mm.
• Fork max tyre clearance (without fenders): 650B × 57C / 700C × 57C.
• Frame max tyre clearance (without fenders): 650B × 52C / 700C × 40C.
• Max chainring 1x: 44 T with 45 mm chainline.
• Max chainring 2x: 50 / 36 T with 45 mm chainline.
• Seatpost diameter: 27.2 mm.
• Seat clamp diameter: 29.8 mm.
• Front derailleur clamp diameter: 28.6 mm.
• Front derailleur compatible: yes.
• Brake mount front: FM 160 / 180.
• Brake mount rear: FM 140 / 160.
• Max rotor front: 180 mm.
• Max rotor rear: 160 mm.
• Front thru-axle: 12 × 100 mm, 1.5 thread pitch.
• Rear thru-axle: 12 × 142 mm, 1.5 thread pitch.
• ISO testing standard: Road.
• Bike trailer: approved.
• Seat tube mounted child seat: approved.
• Derailleur hanger: BT-DH-008.
• Frame small parts: BT-CR-007 / BT-CR-006.
• Front thru-axle: BT-TA-F-601.
• Rear thru-axle: BT-TA-R-602.

Technical specifications – frame & fork

• Model: Hook EXT Frameset.
• Color offered by Bikejamming: Metallic Sunglow Fade.
• Frame: Columbus Cromor double-butted steel, TA, rack/fender mounts, internal light cable routing, rear light mount, 85.5 mm T47 BB shell.
• Fork: Seido MGV full carbon, TA, 1.5" – 1 1/8" tapered steerer, fender / triple cage mounts, lowrider compatible, 180 mm max rotor, internal hub dynamo cable routing.
• Headset: sealed external aheadset, 1.5" – 1 1/8".
• Thru-axles: 12 × 100 mm front / 12 × 142 mm rear.
• Seat clamp: Bombtrack Prime 29.8 mm.
• Frameset weight: 2710 g frame (size L, incl. TA & hanger) / 550 g fork (300 mm steerer, incl. TA).
• Max rider + luggage weight: 130 kg.
• ASTM riding condition: 2.
• Final product appearance, finish and minor details may vary.

Geometry & size guide

Size recommendations are indicative and based on rider height only. If you are planning a build around the Hook EXT Frameset, we can help you interpret its geometry and technical standards to choose a configuration that fits your project: info@bikejamming.it.

We can help you identify compatible components and define the most suitable configuration for your build project based on the Hook EXT Frameset.