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Factor Ostro Gravel Disc Frameset (Without barstem)

Factor Ostro Gravel Disc Frameset (Without barstem)

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Discover the all-road all-star

Speed is your goal. Every ride, whateverthe surface, faster is what counts, and this is the gravel bike you’ve beenwaiting for. The OSTRO Gravel takes its ‘win everywhere’ mentality from its roadracer stablemate, the OSTRO VAM, and is likewise developed to dominate itscategory with incredible aero, superior handling, high stiffness and lowweight. With a tire capacity of 45mm, it’s ready to go anywhere, fast.


Real-world gravel aero

Gravel racing is fast and aero reallymatters, but it isn’t as fast as road racing so the requirements are different.The OSTRO Gravel frame is carefully optimized for the speeds at which you’ll beriding. Our team used a ‘zoned aero’ strategy which focused the front of thebike on aerodynamics because it meets clean, or freestream, air flow, and therear of the bike on lightness, where the air flow is too chaotic and ridequality is the priority. In particular, a lot of time was spent on the headtube, where an all-new tube shape unlocked significant drag reductions bymanipulating the ‘laminar separation bubble’ that occurs near the front ofairfoils at lower speeds. The tech is rooted in aerospace but all you reallyneed to know is that the OSTRO Gravel will get you to your finish line faster,and by minutes, not seconds.


45mm tire clearance

The OSTRO Gravel offers a generous 45mm oftire clearance in both 700c and 650b, giving you the options and possibilitiesto tackle the toughest routes and events. This is a real figure, with 4mm ofclearance either side in accordance with ISO standards, so the OSTRO Gravel issuper-capable in muddy conditions. That was proven at the queen of gravelraces, the 2022 Unbound 200, where heavy rain made the course brutal and the OSTROGravel was ridden to a top-10 finish. 


Black Inc THIRTY FOUR carbon gravel wheels 

The new Black Inc THIRTY FOUR wheels are -like the OSTRO Gravel itself - dedicated to speed on gravel. Their 34mm depthmaximizes aero gains while keeping weight to a minimum and avoiding too tall acombined rim and tire side area, ensuring crosswind stability. They’re mostaero with a 32mm tire for all-road use, yet also very effective for graveltires up to 43mm. The internal width of 25mm allows bigger tires to take abetter shape. The hookless rim is designed to make it easy to mount tubelesstires, in most cases with a regular floor pump. The rim includes a secondaryshoulder which keeps the tire securely seated in the event of a rapiddeflation, allowing you to come to a controlled stop. The Black Inc hubs run onCeramicSpeed bearings for ultimate efficiency.


Black Inc Aero Integrated Barstem

Aerodynamics and ergonomics - the flaredBlack Inc Aero Integrated Barstem takes both to new heights, because riding farand riding fast are not mutually exclusive. Its mid-depth aero profile is theoutcome of tireless research and development, initially using CFD(computational fluid dynamics), then by testing prototypes in a wind tunnel.The result is that it outperforms leading brands of aero road bars and does soat an exceptionally low weight. What’s more, it’s as comfortable as it is fast,thanks to highly refined ergonomics which provide more back sweep for a naturalwrist angle on the tops, more wrist clearance and hand positions thanks to thechamfered corners, a drop shape that accounts for the longer reach of thelatest Shimano and SRAM shifters and a 7-degree flare that starts below theshifter mounting point. The flare adds 3cm of width in the drops, a figurecarefully judged to suit all applications as the Aero Integrated Barstem isdesigned to pull double-duty for both the OSTRO Gravel and OSTRO VAM. Forgravel, enjoy the extra control of the wider drops in descents; for road use,select your usual drop width and benefit from the much more aero positionachievable on the narrower hoods. The new Aero Integrated Barstem also gains aGoPro-style computer mount, adding angle adjustment and a more supported secondmount for a light or action camera.


Steering geometry optimized for all tiresizes

Many all-road and gravel bikes struggle todeliver steering that’s effective and confident both on- and off-road,typically ending up with an unsatisfying compromise of soft handling and modesttire capacity. The OSTRO Gravel breaks that mold by making the tire size anintegral part of the geometry. Wider tires also have a greater outside diameter(or rolling circumference) which increases the true, or ‘resulting’ trail of abike; narrower tires have a smaller outside diameter which reduces resultingtrail. These outcomes match the handling response you want when riding thoserespective tires, so we designed with resulting trail as the priority. Weselected a trail value on the slightly faster handling side for gravel use,given the bike’s racing focus, while prioritizing head tube angle whenselecting our fork rake. This leads to a fast handling gravel bike on 43mmtires and an equally satisfying and precise all-road machine on 32s, with nolow-speed wheel flop.


Best-in-class weight

At only 900g, the OSTRO Gravel is one ofthe lightest gravel frames available. We have used the very best materials toreach such a low weight for an aero frame, ensuring that lightness is matchedby sensational ride quality and the immense durability you want for seasonafter season of epic gravel racing.


Carbon compliance and aero performance

Leveraging our in-house carbon expertise,we have precisely shaped the OSTRO Gravel’s tubes to create a tuned ride withoptimized performance characteristics. The head tube has received an entirelynew shape compared to the road OSTRO VAM to enhance its aerodynamic propertiesat gravel speeds. The remainder of the frame uses the proven tube profiles fromthe OSTRO VAM, providing both snappy performance and aero efficiency.


Electronic shifting and disc brakes only

In line with rider demand and facilitatinga reduction in aero drag and weight, the OSTRO Gravel is built exclusively forelectronic shifting groupsets and disc brakes. Cable and hose routing is fullyinternal.

Handlebar and stem compatibility

While the OSTRO Gravel pairs ideally withthe Black Inc Aero Integrated Barstem, we have designed the front end to beeasily compatible with various third party internal routing systems, so you canalways have the exact touch points you want.


Proven round steerer tube

Our engineers chose a round steerer whichhas been proven as the most durable solution for the rigors of serious gravelriding and racing. The 1-½” upper and lower bearings with a modified split ringallow for the cables to pass through the bearing, easing maintenance demands.


T47 BB standard

The T47 standard for threaded bottombrackets ensures a secure fit and easy maintenance. It allows for the use of awide range of crank spindle diameters and helps keep the bottom bracket shellrobust for exceptional power transfer.


Sized-based fork offsets

Basing our fork offset on the size of theframe ensures optimum handling characteristics across all frame sizes so thatevery customer has the best ride experience.


Extra mounts

To be self-sufficient in the world’shardest gravel events, you need extra carrying capacity. We have added mountingbosses to the top tube and down tube so that you can make it feed stations orgas stations, even on the toughest days.



Frame: TeXtreme®, Toray®, Nippon Graphite®Pitch-Based Fiber

Fork: OSTRO Wide Stance Fork

Seatpost: 0 and 20mm setback available

Barstem: Black Inc Aero Integrated BarstemReach 80mm, drop 120mm. Multiple stem lengths and bar widths available

Headset: CeramicSpeed SLT 1.5"bearings

HEAD TUBE DIAMETER: 1.5" upper and lower

BOTTOM BRACKET: CeramicSpeed T47A Aluminiumcups / CeramicSpeed bearings with Wheels MFG 24mm BBRight Reducers / Adapters




FRONT AXLE: 12 x 100mm thru-axle

REAR AXLE: 12 x 142mm thru-axle


FINISH/COLOR: Naked Grunge, White Grunge

MANUFACTURER WARRANTY: Limited LifetimeWarranty

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