No products in the cart.Return to Shop
Completely reworked super-light cross-country hardtail, perfect for racing and fast riding. As a bonus, it even fits tires up to 3″ for the roughest terrain.
In 2012 we introduced the O-1.0; the world’s first sub-900 gram hardtail. It was the perfect XC racing machine as our customers (you!) have proven that time and time again, from World Cup cross country races to Cape Epic wins (without sponsorships!)
By mid-2015, we were almost ready to introduce the ONE, but a delay in manufacturing and the introduction of the Boost standard made us change our mind. Boost increases wheel & frame stiffness and improves tire clearance. This was too good a chance to pass up, and so we reworked the frame completely into what is now the ONE+
The ONE+ is still that zero-compromise XC racing machine; our customers expect this from us and so we made absolutely no compromise here. Boost, a BB92 bottom bracket and our Thru-Thread thru axle increase drivetrain stiffness further, while new Wire-stays improve vertical compliance & traction. A dozen more tweaks and updates make the ONE+ a much, much better frame than we ever thought possible.
And then the bonus: Boost not only increases wheel and frame stiffness, it also increases tire clearance, meaning it now fits a range of 29er XC tires and 27.5+ semi-fat tires. See it all explained below.
The ONE+, like its predecessor the O-1.0, is all about agile handling and efficient power transfer in a super-light package. But we greatly increased the tire options:
|1)||For 29er setups – depending on the rim width – up to 2.4” tires fit. With wider rims, use a smaller tire as it balloons up anyway thanks to the rim.|
|2)||For 27.5” setups, up to 3.0” tires fit. Again here this depends on the rim width.|
ALWAYS check the tire on the rim you want to use, and make sure you have 6mm clearance between tire and rim. There is so much variation in actual tire and rim widths between manufacturers that it is almost irrelevant how the tire is labeled. You need to measure.
Note that for the size Small, the wheels are proportionate for a much better fit and more agile handling. So the XC wheels are 27.5” and the semi-fat wheels are 26+.
Lots of confusion in the mountain bike world nowadays, between three wheel sizes, several axle standards, Fat & Plus tires, Boost, etc.
So let’s talk about Boost. It’s really quite simple, Boost moves the chain outward by 3mm without changing the Q-factor (pedal stance) of the crank. It basically uses up the space created when high-end bikes stopped using triple cranks.
Also moving the cassette out 3mm plus another 3mm on the disc brake side means the rear wheel axle grows from 142 to 148mm. This improves the angles for the spokes to create a stronger, stiffer wheel. Great for big 29er wheels but really a good thing for every wheel size.
Bottomline: same pedal stance/Q-factor up front for good pedalling efficiency, wider spoke stance in the rear for stiffer, stronger wheel builds. If you want, you can also do the same trick in the front with a Boost front hub (110mm vs 100mm) but that’s optional.
Why do we add Boost to this frame? Because it adds stiffness to the build, because it works well with the wider rims that we prefer and because it creates more tire clearance between tire and chain. Aside from these advantages, there really aren’t any drawbacks now that all manufacturers have started making their components in Boost versions.
To create space for bigger tires, the ONE+ features OPEN’s trademark dropped chainstay. A clean and simple method to move the chainstay away from the most crowded real estate on a frame and towards an area where we can boost the chainstay size for the most efficient power transfer.
“100% hi-modulus carbon”, “aero-space grade”, etc. Useless – and hopefully false (we’ll get to that) – claims meant to impress you.
It’s not about high- or low-modulus, it’s about the right carbon in the right spot. And because the bike industry loves techie-sounding abbreviations, we’ll humor them and call it TRCinTRS™.
Fact: stiffer carbon is more brittle. Strategically placed ultra-high-modulus carbon is a good idea. Making the whole headtube out of it when you have big impact loads is not!
The best lay-up is not 100% of one modulus; it’s a blend. We use the highest modulus (stiffest) carbon of any bike manufacturer where we can, and tougher grades of carbon where we must. That’s how our frames are both light and durable.
The rear triangle has to provide lateral stiffness for an efficient drive train, but vertical compliance for better comfort. The ONE+ features chainstays and seatstays that are extremely thin vertically to provide that compliance, while their lateral width and layup ensure rock-solid propulsion.
The seatstays are pre-curved so they can absorb even small bumps very quickly. But lay the bike into a turn and you’ll notice how stiff they are laterally. Truly the best of both worlds.
The downtube is the key for stiffness, connecting the steering center of your frame with the drivetrain. The flat-out downtube’s characteristically flat outside faces allow us to strategically place strips of ultra-high modulus carbon far away from the center plane. The stiffest carbon exactly where it matters, guaranteed!
With a minimalist 27.2mm diameter we maximize the flex in our seatpost & seattube. This is especially a big plus on rough terrain. The seattube angle is designed around the use of a straight, zero-setback seatpost rather than a regular seatpost with setback (we’ve never understood those). Zero-setback posts are lighter, saving you another 10-30 grams (every little bit helps).
External cables & hoses collect dirt, risk getting stuck behind objects (particularly expensive with electronic shifting) and frankly, they are ugly. So the ONE+ runs them internally.
With our proven MultiStop design, you can customize the frame for 2×10/11, 1×10/11 and Di2 shifting. Just pick the right insert.
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.
Seatposts usually indicate a minimum insertion dimension. That keeps the seatPOST safe, but it’s also important that the seatTUBE is supported properly. The minimum insertion for that is indicated by the SafePost Pilot hole.
The ONE+ uses a 92mm bottom bracket standard. This allows you to directly mount a Shimano or SRAM 24mm crank in the frame (the wider BB shell replaces the outboard bearing cups, essentially integrating them into the frame structure).
You can even fit cranks with wide, 30mm axles by using a special super-light bearing set (for example the THM M3 and RaceFace SL cranks) for the stiffest, lightest possible set-up.
|Frame sizes:||S, M, L|
|Frame-only weight (+/- 3%):||Size S: 848g
Size M: 869g
Size L: 885g
|BB std:||BB92 PressFit|
|Recommended fork:||100-120mm travel, 44-46mm offset|
|Crank std:||Boost 1x or 2x (for 24mm or 30mm axles depending on crank brand)|
|Max. 1x ring size:||Clearance depends on crank & chainring model. 2mm space is required. For most current generation cranks, the following applies: 36t|
|Tire fit for frame:||Up to 29×2.4”, up to 27.5×3.0” for size M & L up to 27.5×2.4”, up to 26×3.0” for size S Always ensure 6mm clearance between tire and frame!|
PLEASE read this before you jump into the numbers, so at least they make sense:
S, M, L
FRAME OPEN ONE + FIX MOUNTAIN FORK SRAM Force 1 PM 1×11 ENVE ROAD/ GRAVEL FULCRUM RED FIRE 5, FRAME OPEN ONE + Rockshox SID SL ULT Shimano Deore XT M8100 XC FULCRUM RED FIRE 5, OPEN ONE + Rockshox SID SL ULT SRAM XX1 Eagle AXS 1×12 MAGURA MT8 PRO ENVE 27G/ M630