Open U.P.P.E.R Gravel Frameset

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The worlds best gravel bike get's an upgrade and loses some serious weight. Lighter frame, flat mount brakes, and an improved fork. Same great geometry and tire clearance. 

The super light U.P.P.E.R. with OPEN U-turn fork for flat-mount disc brakes Overall, the U.P. and U.P.P.E.R. share the same principles of intended use, same tire clearance, same exact shape and geometry. But they differ in layup, weight, fork, disc brake mounts, thru-axles and color.

One of the key differences between the U.P. and U.P.P.E.R. is the disc mount standard. The U.P. uses post-mount, whereas the U.P.P.E.R. is designed for flat-mount. We don't like how the bike industry keeps “inventing” new standards, so we always investigate if they are an improvement before we use them.

New Fork:  For the U.P.P.E.R., Open designed a new fork that accepts flat-mount calipers without the need for an adapter. So you can get your Shimano or SRAM flat-mount caliper, remove the standard adapter it comes with, and bolt it directly onto our fork.

This saves weight and increases the stiffness of the braking system.

Open U.P.P.E.R. ships standard with the U-turn. Since the U.P. is a post-mount frame, it ships with a post-mount fork, the 3T Luteus II.

Frame-only weight (±3%):
U.P.   1100g (size M)
U.P.P.E.R.   870g (size M)
U.P.   3T Luteus II with 15mm thru-axle
U.P.P.E.R.   OPEN U-turn with 12mm thru-axle
U.P.   Orange (standard)Brown, RTP (Ready-To-Paint)
U.P.P.E.R.   Matte black
BB std: BB386EVO


Headset std: Integrated Tapered IS42/28.6 | IS52/40
Seatpost Ø: 27.2mm
Rear axle std: 142x12mm (X-12) thru axle (Syntace for U.P., Carbon-Ti for U.P.P.E.R.)
Brake std:
U.P.   Front & rear: Post mount for 160mm rotors
U.P.P.E.R.   Front: direct-mount flat-mount for 160mm rotor; Rear: flat-mount for 140mm rotor (160mm with adapter)
Cable routing: Internal via exchangeable MultiStops for 1x10/11, 2x10/11, Di2
Bag mount: 100mm front-post-to-bearing-bore-edge
Incl. in box: Frame, fork, headset, seattube collar, front & rear thru-axle, 2 rear derailleur hangers, 1 removable front derailleur mount, cover bolts for front derailleur mount posts, 3 MultiStops (2x, 1x, Di2), chainstay cable exit stop, BB guide, cable sleeves, noise-reduction foam sleeves, bottle cage bolts, manual

Tire clearance

The U.P. fits mountain bike tires up to 2.1” wide. But you can also fit a 40mm cross tire, or a 28mm road tire, or anything else in-between (exact tire sizes depend on manufacturing tolerances and rim width, so this is a guideline. Always make sure you have 6mm clearance between tire and frame).

How do we fit such a wide range of tires without affecting the handling? Let's start with the numbers; below is the outside radius for various wheel+tire combos:

341mm 700c/29er 28mm road
344mm 700c/29er 32mm cross
350mm 700c/29er 40mm cross
342mm 650b/27.5" 2.1" mtb
365mm 700c/29er 2.1" mtb



Build Type:
Frameset Disc Brake