Surly

Surly OgreGeometry & Bikepacking Bag Fit

Name: Surly Ogre
Brand: Surly

Frame

4130 Chromoly steel

Wheel size

Max tyre

29 x 2.5 in

From

$1,799

Sizes

Surly Ogre 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.

Surly Ogre — Small. Front triangle ≈ 1120 cm² · effective top tube 575mm · seat tube 406.4mm — Surly Ogre in size Small, drawn to scale from Surly's published geometry. The shaded area is the front triangle — roughly 1120 cm² of space for a frame bag. Wheels are indicative; frame lines are accurate.

Surly Ogre — Medium. Front triangle ≈ 1301 cm² · effective top tube 595mm · seat tube 457.2mm — Surly Ogre in size Medium, drawn to scale from Surly's published geometry. The shaded area is the front triangle — roughly 1301 cm² of space for a frame bag. Wheels are indicative; frame lines are accurate.

Surly Ogre — Large. Front triangle ≈ 1494 cm² · effective top tube 615mm · seat tube 508mm — Surly Ogre in size Large, drawn to scale from Surly's published geometry. The shaded area is the front triangle — roughly 1494 cm² of space for a frame bag. Wheels are indicative; frame lines are accurate.

Surly Ogre — X-Large. Front triangle ≈ 1708 cm² · effective top tube 640mm · seat tube 558mm — Surly Ogre in size X-Large, drawn to scale from Surly's published geometry. The shaded area is the front triangle — roughly 1708 cm² of space for a frame bag. Wheels are indicative; frame lines are accurate.

How it rides loaded

440mm chainstays, 68mm BB drop, large tire clearance, and Four-Pack fork mounts make it load-friendly; no internal dropper routing limits technical loaded trail setup.

Drawn from the published geometry and mount spec above, not from reputation.

What it can carry

Mount provision and clearance, as Surly publishes it.

Fork mounts

2 Four-Pack mounts; upper, lower, and mid-blade rack mounts

Bottle mounts

2 Three-Pack on XS-SM; 1 standard plus 2 Three-Pack on MD-XL

Rack & fender

Frame/fork rack and fender mounts; trailer mounts published

Max tyre clearance

29 x 2.5 in; alternate 27.5 x 3.0 in; Surly summary says 29 x 2.5 or 27.5 x 2.8 with fenders

Dropper post

No internal routing

Geometry

All figures in millimetres 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
Small	575	406.4	763.5	110	592	395.5	440	1049.4	68	71.5°	73°
Medium	595	457.2	795.7	120	603.4	410.5	440	1064.5	68	72°	73°
Large	615	508	824.5	130	613	427.6	440	1084.6	68	72°	73°
X-Large	640	558	857.85	150	632	447	440	1110	68	72°	73°

Source — Surly's own geometry chart: https://surlybikes.com/products/ogre-fermented-plum — checked 2026-08-16. A dash means the figure isn't published; we leave it blank rather than estimate.

Note: Current Surly page does not publish a model year.

Which frame bags fit

Every frame bag we track, checked against this frame's published geometry. Pick your size.

Checking 12 frame bags against a 615mm effective top tube and 508mm seat tube. 12 fit.

Excellent fit

Topeak Midloader Frame Bag