Opencycle U.P. Σκελετός Cyclocross

Opencycle U.P. Σκελετός Cyclocross
U.P. (Unbeaten Path) combines a performance-oriented cross/road geometry & parts with clearance for mountain bike tires. So you can ride anywhere, and ride fast.

Get out of town on asphalt, hit the gravel roads or switch to singletrack. The geometry gets you there fast; the big tires make you unstoppable.
Sales price € 2.900,00
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So you can ride anywhere, and ride fast.

Get out of town on asphalt, hit the gravel roads or switch to singletrack.

The geometry gets you there fast; the big tires make you unstoppable.

 

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:

RadiusRimTire
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

As you can see, the top-4 wheel+tire combos (700c cross/road tires and 650b mountain bike tire) are very close in radius, the bottom one (the 29er mountain bike tire) is way off.

So you’ll hardly notice a difference in geometry swapping 700c cross/road and 650b mountain bike tires on the U.P., while 29er tires would make a total mess of the handling.

There is a second reason we designed for 650b and not 29er tires. They would require very long chainstays, while the U.P. now sports a very short 420mm rear end. Most gravel and cross bikes have longer chainstays than that yet they can't fit anywhere near the same size of tire.

 

Crank clearance

Behind the bottom bracket, the chainrings, frame and tire all fight for space. And with the need to fit big mountain bike tires and narrow Q-factor cross/road cranks & chainrings, the U.P. presents the toughest possible packaging problem.

Dropping the right chainstay moves it out of this crowded area, allowing it to be wider and therefore stiffer (a huge effect; with the same amount of material, twice the width will give you eight times the stiffness!).

 

Fully-internal cables/hoses

External cables & hoses collect dirt, risk getting stuck behind objects (particularly expensive with electronic shifting) and frankly, they are ugly. So the U.P. runs them internally.

With our proven MultiStop design, you can customize the frame for 2x10/11, 1x10/11 and Di2 shifting. Just pick the right insert. In case you run a single chainring, you can also remove the front derailleur hanger to further clean up the frame.t internalcables

 

ThruThread dropouts

Most thru-axle frames are heavier than quick-release frames. Extra carbon for the dropouts, heavy hangers, and the axle itself. But they are stiffer, So what do you want most? The answer for most people is “both”, and so we introduce the first frames that combine a thru-axle with a lower weight. How?

The ThruThread design uses the same threads that hold the thru-axle to lock the derailleur hanger into the frame. Simple, light, effective.

We didn’t just redesign the dropout, the entire seatstay and chainstay design is optimized with the added stiffness of the thru-axle in mind. For the thru-axle itself, we recommend the stiffest design available, the Syntace X-12, but you are free to use a different 12mm thru-axle if you want.

 

Geometry

Clearance for cross, road and mountain bike tires, a cross/road position and compatibility with cross/road & mountain bike drivetrains make the U.P. geometry the most complicated we’ve ever worked on. But we’re ecstatic about the result.

Keep in mind that the seattube is designed to be offset, so that your seatpost doesn't have to be. This saves a bit of weight. It also means that the toptube length appears a bit longer than the frame really is, yet another reason why toptube length is a bad measurement to rely on. Best to use stack and reach.

 

up geometry 696

 

 

 geom

 

Specifications

Frame: OPEN U.P.
Frame sizes: S, M, L, XL
Frame weight: 1150g (size L)
Fork: 3T Luteus II Team with 15mm thru axle (included)
Colour:  (white logos),  regular (white logos),  (cyan blue logos, numbered & limited to 20+2 pieces, sold with HED Ardennes)
BB std: BB386EVO
Chainring fit:
NOTE:  For single chainring set-ups, we recommend flat rings, not offset rings, for the best chainline. For "regular" oval rings, deduct 2 teeth from the below spec. For extreme oval rings, who knows.
Max inner ring: 36t
Max outer ring: 50t (more is overkill with the bigger tires)
Max single ring: 46t (offset rings like SRAM 1x)
Max single ring: 50t (flat rings, better cassette alignment)
Headset std: Integrated Tapered IS42/28.6 | IS52/40
Seatpost Ø: 27.2mm
Rear axle std: 142x12mm thru axle
Rear brake std: Post mount for 160mm disc
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
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