Ritchey Outback Geometry & Bikepacking Bag Fit2025
The same page we read this geometry from. We don't hold live pricing or stock for frames, so check both there.
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Ritchey Outback 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.
453mm chainstays, 18mm longer than the 435mm median across the 65 current frames here. Bottom bracket drop 68-70mm, close to the 70mm median. The fork publishes cargo mounts, and the frame publishes bottle or accessory mounts. A rear rack bolts straight on. Widest published tire 51mm on 650b / 27.5in, 48mm 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 Ritchey publishes it.
Ritchey's wording: “Wheel and tire compatibility 700 x 48mm or 650 x 2.0in (depending on tire/rim manufacturer)”
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 | 526 | 410 | 740 | 115 | 532 | 373 | 453 | 1047 | 70 | 69.5° | 74° |
| S | 541 | 435 | 759 | 130 | 548 | 378 | 453 | 1053 | 70 | 70° | 73.5° |
| M | 557 | 460 | 782 | 150 | 567 | 383 | 453 | 1061 | 68 | 70.5° | 73° |
| L | 570 | 490 | 806 | 170 | 587 | 390 | 453 | 1070 | 68 | 71° | 73° |
| XL | 581 | 525 | 832 | 190 | 606 | 395 | 453 | 1081 | 68 | 71° | 73° |
| XXL | 595 | 555 | 862 | 220 | 637 | 400 | 453 | 1091 | 68 | 71.5° | 73° |
Bottom bracket height
Roughly 305–307mm off the ground. Ritchey doesn't publish this directly — we derive it from their BB drop and a typical 75cm 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 — Ritchey's own geometry chart: https://ritcheylogic.com/bike/frames/outback-frameset — checked 2026-08-18. A dash means the figure isn't published; we leave it blank rather than estimate.
Note: Manufacturer page description identifies this edition as the 2025 Outback. Manufacturer page does not publish a direct price. Geometry lengths are published in millimetres; angles are published in degrees. Ritchey routes the dropper internally through the seat tube only (DSP).
How the Outback compares
Against the frames people actually cross-shop it with — both charts held together, on the specs that decide what the bike carries.
Questions people ask about this frame
Answered from what Ritchey publish. Where they publish nothing, that is what it says.
Does the Outback take fork cargo cages?
Rack mounts, not cage mounts. The fork mounts Ritchey publish are for racks or fenders, and a lowrider eyelet won't take a cargo cage. That doesn't rule cages out — it means nobody has said.
What is the widest tyre the Outback takes?
51mm on 650b / 27.5in. Across the wheel sizes Ritchey publish: 48mm on 700c / 29in, 51mm 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 Outback?
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 570mm effective top tube and 490mm seat tube. 16 fit.
Frame bag fit is calculated from Ritchey'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.