Bombtrack Hook EXTGeometry & Bikepacking Bag Fit2026
What it can carry
Mount provision and clearance, as Bombtrack publishes it.
Bombtrackdoesn't publish a figure we can compare — see their wording below.
Bombtrack's wording: “Frame max tire clearance w/o fender: 52-584 / 40-622; Fork max tire clearance w/o fender: 57-584 / 57-622”
Geometry
All figures in millimeters except angles. Effective top tube and seat tube are the two that decide frame bag fit.
| Size | Eff. top tube | Seat tube | Standover | Head tube | Stack | Reach | Chainstay | Wheelbase | BB drop | Head angle | Seat angle |
|---|---|---|---|---|---|---|---|---|---|---|---|
| XS | 519 | 460 | 748 | 110 | 554 | 365 | 425 | 995 | 75 | 71.5° | 74.5° |
| S | 533 | 500 | 776 | 130 | 573 | 374 | 425 | 1010 | 75 | 71.5° | 74.5° |
| M | 556 | 530 | 803 | 150 | 589 | 387 | 425 | 1025 | 70 | 72° | 74° |
| L | 570 | 570 | 831 | 170 | 608 | 396 | 425 | 1040 | 70 | 72° | 74° |
| XL | 595 | 600 | 855 | 190 | 627 | 409 | 425 | 1060 | 70 | 72° | 74° |
Bottom bracket height
Roughly 296–301mm off the ground. Bombtrackdoesn't publish this directly — we derive it from their BB drop and a typical 74.2cm tire diameter, so treat it as indicative rather than exact. It changes with the tire you fit. Lower means more stable and more pedal strikes; higher means the opposite.
Source — Bombtrack's own geometry chart: https://bombtrack.com/products/bombtrack-hook-ext-frameset — checked 2026-08-18. A dash means the figure isn't published; we leave it blank rather than estimate.
Note: Manufacturer's current product page found for the Hook EXT frameset; complete-bike geometry is also published on Bombtrack's Hook EXT page with the same geometry values. Price not published on the sourced manufacturer page.
Which frame bags fit
Every frame bag we track, checked against this frame's published geometry. Pick your size.
Checking 19 frame bags against a 556mm effective top tube and 530mm seat tube. 19 fit.
Frame bag fit is calculated from Bombtrack's published geometry, so it's as reliable as their chart. Seat packs and handlebar rolls depend on your exposed seatpost and bar width, which no geometry table lists — the bag finder covers those once you add your own measurements.