All-City Gorilla Monsoon Geometry & Bikepacking Bag Fit2024
Discontinued. All-City no longer lists the Gorilla Monsoon. It's here because these frames stay in circulation second-hand and the geometry is still what you need to pick bags — but you won't find one new.
All-City Gorilla Monsoon frame geometry, drawn to scale
Every tube angle and length below is from the published chart, not an illustration. The front triangle area is the number that decides which frame bags fit — and it changes a lot across sizes.
What this frame gives a loaded bike
Chainstay length is the gap between the seat tube and the rear axle, which a rack, panniers and your heels all have to share. Bottom bracket drop is how far the cranks sit below the axles. Both are compared against the median across every current frame we hold.
430mm chainstays, 5mm shorter than the 435mm median across the 65 current frames here. Bottom bracket drop 62.5mm, 8mm less than the 70mm median. All-City publishes no fork cargo mounts, and the frame publishes up to 2 bottle or accessory positions. A rear rack bolts straight on. Widest published tire 61mm on 650b / 27.5in, 42mm on 700c / 29in. It takes a dropper post.
Every figure above is the manufacturer's, computed against the rest of the database. It says what the frame allows, not how it feels — nobody here has ridden it.
What it can carry
Mount provision and clearance, as All-City publishes it.
All-City's wording: “Tire Clearance Frame [1]/[2] + 27.5 x 2.4", 700c x 42mm; Tire Clearance Fork [1] + 27.5 x 2.4", 700c x 42mm”
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 43cm | 505 | 415 | 711 | 115 | 534 | 357 | 430 | 1007 | 62.5 | 70° | 74.5° |
| 46cm | 520 | 445 | 735.5 | 125 | 547 | 363 | 430 | 1008 | 62.5 | 71° | 74° |
| 49cm | 528 | 475 | 758.2 | 135 | 557 | 368 | 430 | 1017 | 62.5 | 71° | 74° |
| 52cm | 545 | 510 | 788.3 | 155 | 579 | 374 | 430 | 1021 | 62.5 | 71.5° | 73.5° |
| 55cm | 565 | 540 | 813.4 | 175 | 598 | 382 | 430 | 1036 | 62.5 | 71.5° | 73° |
| 58cm | 585 | 570 | 840.1 | 200 | 621 | 389 | 430 | 1051 | 62.5 | 71.5° | 72.5° |
| 61cm | 605 | 600 | 866.8 | 225 | 645 | 402 | 430 | 1072 | 62.5 | 71.5° | 72.5° |
Bottom bracket height
Roughly 309mm off the ground. All-City doesn'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 — All-City's own geometry chart: https://allcitycycles.com/bikes/gorilla-monsoon-frameset — checked 2026-08-18. A dash means the figure isn't published; we leave it blank rather than estimate.
Note: Manufacturer page is for the Gorilla Monsoon LTD Frameset. All lengths were already published in millimetres. Tire-clearance footnotes: [1] Different tire and rim combinations will result in different clearances. [2] Depending on drivetrain configuration, tire clearance may be limited by the chain and not the frame. All-City/QBP announced no new product development beyond model year 2024, so no manufacturer-published 2026 model year was found. All-City lists the frame as internal dropper post routing compatible. All-City publishes Bottle Mounts Fork as None, so there is no fork cargo-cage provision; the fork's rack and fender mounts are recorded under rack mounts.
Questions people ask about this frame
Answered from what All-City publish. Where they publish nothing, that is what it says.
Does the Gorilla Monsoon take fork cargo cages?
Not published. All-City don't state any fork mount provision for this frame. That isn't the same as it having none, and we won't guess from a photo.
What is the widest tyre the Gorilla Monsoon takes?
61mm on 650b / 27.5in. Across the wheel sizes All-City publish: 42mm on 700c / 29in, 61mm on 650b / 27.5in. Those are frame figures, not the fork's — forks are routinely cut for more rubber than the rear triangle.
Will a seat pack work on the Gorilla Monsoon?
The dropper is the problem, not the pack. This frame publishes dropper routing, and a dropper and a seat pack want the same space — fitting one rules out almost every strap-on seat pack and leaves rail-mounted bags at a fraction of the volume. Run a rack or a saddle-rail bag if you want both.
Which frame bags fit
Every frame bag we track, checked against this frame's published geometry. Pick your size.
Checking 16 frame bags against a 545mm effective top tube and 510mm seat tube. 16 fit.
Frame bag fit is calculated from All-City'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.