Esker Japhy vs Surly Karate Monkey
Both published charts held against each other, on the specs that decide what the bike carries.
The short answer
The Japhy takes tire clearance; the Karate Monkey takes frame bag space and bottle positions. 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
5 of the 6 things we can compare come out differently. The rest are close enough not to decide anything.
Frame bag space
121 cm² more on the Karate MonkeyFront-triangle area at the largest size, computed from stack, reach and seat angle. It is what decides how much full-frame bag you can run, and a frame bag is the one place weight sits low and central.
Widest published tire
7mm more on the Japhy on 700c / 29inThe frame figure, not the fork's — forks are routinely cut for more rubber than the rear triangle, and compared only on a wheel size both frames publish. Loaded, tire width is also seat-pack clearance: a big tire and a sagging pack compete for the same space.
Rear rack
only the Japhy publishes a rear rack answerRead 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.
Fork cargo mounts
only the Karate Monkey publishes somewhere to bolt a cageCage mounts on the fork blades. This moves weight low and off the bars, which is where a heavy bar roll does the most to the steering. A frame with none published may still have them — it means the maker does not say.
Frame bottle positions
1 more on the Karate MonkeyThe maximum the maker publishes across sizes. Worth knowing before you buy a frame bag, because a full-frame bag covers most of them.
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.
| Esker Japhy | Surly Karate Monkey | |
|---|---|---|
| Frame bag space | 1523 cm² | 1644 cm² |
| Widest published tire | 71mm on 700c / 29in | 64mm on 700c / 29in, 76mm on 650b / 27.5in |
| Rear rack | Needs an extra part — Portage Rack Mount Bolts and a Seatpost Clamp with Rack Mounts | Not published |
| Fork cargo mounts | None published | Published |
| Frame bottle positions | 2 | 3 |
| Chainstay | 430mm | 423mm |
| Sizes | 4 | 5 |
| Frame | Quad-butted 4130 chromoly steel | 4130 Chromoly, Natch tubing, double-butted main triangle |
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.
