Bombtrack Hook EXT vs Surly Grappler
Both published charts held against each other, on the specs that decide what the bike carries.
The short answer
The Hook EXT takes the rack path; the Grappler takes tire clearance and dropper compatibility. Which matters more is your route, not a scoreboard.
Assembled from the differences below rather than written over them, so it cannot drift from the table. Every figure is the manufacturer's; nobody here has ridden either bike.
Where they differ
3 of the 6 things we can compare come out differently. The rest are close enough not to decide anything.
Widest published tire
24mm more on the GrapplerThe frame figure, not the fork's — forks are routinely cut for more rubber than the rear triangle. Loaded, tire width is also seat-pack clearance: a big tire and a sagging pack compete for the same space.
Rear rack
Hook EXT is the one you can bolt a rack to without hunting for partsRead from each maker's own mount wording. An adapter is a real cost the price tag does not mention, and 'not published' is not the same as no — it just is not something to buy a rack on.
Dropper post
only the Grappler publishes dropper routingA dropper cannot be strapped to, so fitting one rules out almost every seat pack and leaves rail-mounted bags at a fraction of the volume. It is a capability and a constraint at once.
Side by side
Including the rows where the two are level, because a spec that doesn't separate them is still a spec you might be checking.
| Bombtrack Hook EXT | Surly Grappler | |
|---|---|---|
| Frame bag space | 1698 cm² | 1700 cm² |
| Widest published tire | 40mm on 700c / 29in, 52mm on 650b / 27.5in | 64mm on 700c / 29in, 76mm on 650b / 27.5in |
| Rear rack | Bolts straight on | Not published |
| Fork cargo mounts | Published | Published |
| Dropper post | Not published | Compatible |
| Chainstay | 425mm | 425mm |
| Sizes | 5 | 5 |
| Frame | Steel | 4130 Chromoly steel |
Drawn to scale
Largest published size of each, built from the charts rather than illustrated. The front triangle is the part that decides frame bag fit.
