Specialist in triathlon, swimming, cycling and running. Triathlon store in Paris and Nice

Triathlon, cycling, running, swimming specialist

FACTOR OSTRO GRAVEL

Discover the versatile star of road and off-road.

Speed ​​is your goal. On every ride, no matter the surface, it’s about going faster, so this is the gravel bike you’ve been waiting for. The OSTRO Gravel takes its “conquer anywhere” mindset from its road racing sibling, the OSTRO VAM, and is also built to dominate its class with incredible aerodynamics, superior handling, high stiffness and low weight. With 45mm tire capacity, it’s ready to go anywhere, fast.

A REAL GRAVEL AERO

Gravel racing is fast and aerodynamics really matter, but it’s not as fast as road racing, so the demands are different. The OSTRO Gravel frame is carefully optimized for the speeds you’ll be riding at. Our team used a “zonal” aerodynamic strategy that focused on the front of the bike for aerodynamics because it encounters clean airflow, or free airflow, and the rear of the bike for lightness, where the airflow is too chaotic and ride quality is the priority. A lot of time was spent on the head tube in particular, where a new tube shape helped significantly reduce drag by manipulating the “laminar separation bubble” that occurs near the front of the airfoils at low speeds. The technology is rooted in aerospace, but all you really need to know is that the OSTRO Gravel will get you to the finish line faster—in minutes, not seconds.

Clearance for 45mm tires

The OSTRO Gravel offers a generous 45mm of tyre clearance in both 700c and 650b, giving you options and possibilities to tackle the toughest routes and events. This is a real-world measurement, with 4mm of clearance per side in line with ISO standards, so the OSTRO Gravel is extremely capable in muddy conditions. This was proven at the king of gravel races, the 2022 Unbound 200, where heavy rain made the course brutal and the OSTRO Gravel was used to a top-10 finish.

BLACK INC THIRTY FOUR carbon gravel wheels

The new Black Inc THIRTY FOUR wheels are – just like the OSTRO Gravel itself – dedicated to gravel speed. Their 34mm depth maximises aerodynamic gains while keeping weight to a minimum and avoiding a high combined rim and tyre lateral area, ensuring stability in crosswinds. They are the most aerodynamic with a 32mm tyre for all-round use, but are also very efficient for gravel tyres up to 43mm. The 25mm internal width allows wider tyres to take a better shape. The hookless rim is designed to make it easier to mount tubeless tyres, in most cases with a normal pump. The rim includes a secondary shoulder that holds the tyre securely in place in the event of rapid deflation, allowing you to stop in a controlled manner. The Black Inc hubs are equipped with CeramicSpeed ​​bearings for ultimate efficiency.

Look at the landscape: it's blurry.

When you’re pedaling hard, there’s little time to appreciate anything in the countryside other than how fast it’s going. The OSTRO Gravel was designed for these rides, with an unmatched combination of aerodynamics, lightness, compliance and integration. Put your head down and go!

  • THE LIGHTEST IN ITS CATEGORY

    Weighing in at just 900g, the OSTRO GRAVEL is one of the lightest gravel frames available. We’ve used the best materials to achieve such a low weight for an aero frame, ensuring that lightness is combined with sensational ride quality and the immense durability you want for epic racing seasons on any trail.

  • CARBON COMPLIANCE AND AERO PERFORMANCE

    Using our in-house carbon expertise, we precisely shaped the OSTRO GRAVEL’s tubes to create a tuned ride with optimized performance characteristics. The head tube received an entirely new shape compared to the road OSTRO VAM to improve its aerodynamic properties at gravel speeds. The rest of the frame uses the proven OSTRO VAM tube profiles, delivering both lively performance and aerodynamic efficiency.

  • ELECTRONIC SHIFTING AND DISC BRAKES ONLY

    In line with cyclists' demands and to reduce aerodynamic drag and weight, the OSTRO GRAVEL is designed exclusively for electronic groupsets and disc brakes. Cable and hose routing is completely internal.

HANDLEBAR AND STEM COMPATIBILITY

While the OSTRO Gravel is ideally matched with the Black Inc integrated handlebar stem, we designed the front of the frame to be easily compatible with various third-party internal routing systems, allowing you to always have the exact contact points you want.

PROVEN ROUND HEAD TUBE

Our engineers opted for a round head tube, recognized as the most durable solution for serious gravel and racing. 1-½" upper and lower bearings with a modified split race allow cables to pass through the bearing, making maintenance easier.

T47 BOTTOM BRACKET STANDARD

The T47 standard for threaded bottom brackets ensures a secure fit and easy maintenance. It allows the use of a wide range of crank diameters and helps keep the bottom bracket shell strong for exceptional power transfer.

FORK OFFSET BASED ON SIZE

By basing our fork offset on frame size, we ensure optimal handling characteristics for all frame sizes, so every customer can enjoy the best riding experience.

ADDITIONAL FIXING POINTS

To be self-sufficient in the world’s toughest gravel events, you need extra carrying capacity. We added mounting points on the top and down tubes so you can attach panniers for refreshments or breaks, even on the most demanding days.

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