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Description
REAL-WORLD AERO FOR GRAVEL
Gravel racing is fast, and aerodynamics make a difference—but at speeds lower than road racing, the design priorities shift. The OSTRO Gravel is fine-tuned for the speeds you’ll actually ride, using a ‘zoned aero’ approach. The front of the bike is engineered for optimal aerodynamics, cutting through clean air, while the rear focuses on weight savings and ride quality, where airflow is more turbulent.
One key breakthrough is the head tube design, which reduces drag by manipulating the laminar separation bubble—a technique rooted in aerospace engineering. The result? The OSTRO Gravel shaves minutes, not just seconds, off your race times.
45MM TIRE CLEARANCE
With clearance for 45mm tires on both 700c and 650b wheels, the OSTRO Gravel is built to take on the toughest terrain. This isn’t a vague estimate—it meets ISO standards with 4mm of extra clearance per side, ensuring top performance even in muddy conditions. Proven at Unbound 200, where brutal rain made the course relentless, the OSTRO Gravel secured a top-10 finish.
BLACK INC THIRTY FOUR CARBON WHEELS
Designed for speed on gravel, the Black Inc THIRTY FOUR wheels balance aerodynamics, weight, and stability. At 34mm deep, they maximize aero efficiency while maintaining crosswind control. Ideal for 32mm tires on all-road rides and up to 43mm for gravel, they feature a 25mm internal width to enhance tire shape.
The hookless rim ensures easy tubeless setup—often with a standard floor pump. A secondary shoulder keeps the tire securely seated during sudden deflations, allowing a controlled stop. The Black Inc hubs, fitted with CeramicSpeed bearings, provide ultra-smooth rolling efficiency.
BLACK INC INTEGRATED AERO BARSTEM
Fast and comfortable, the Black Inc Integrated Aero Barstem pushes both aerodynamics and ergonomics to new heights. Developed through CFD modeling and wind tunnel testing, it outperforms leading aero road bars at an impressively low weight.
Designed for both OSTRO Gravel and OSTRO VAM, it features:
- 7-degree flare for added control on gravel descents while maintaining a streamlined road position.
- Chamfered corners & back sweep for natural wrist angles and multiple hand positions.
- Optimized drop shape for compatibility with modern Shimano & SRAM shifters.
- GoPro-style computer mount with angle adjustment and a reinforced secondary mount for lights or action cameras.
OPTIMIZED STEERING FOR EVERY TIRE SIZE
Many all-road and gravel bikes struggle to balance on-road precision with off-road confidence. The OSTRO Gravel breaks the mold by integrating tire size into the geometry.
Larger tires increase a bike’s true trail, while smaller tires reduce it—naturally aligning with the handling needed for each. The OSTRO Gravel prioritizes a fast, race-ready feel on 43mm gravel tires while maintaining sharp, precise handling on 32mm road tires. No compromises, no wheel flop.
THE SCENERY? JUST A BLUR.
When you’re pushing full gas, there’s no time to admire the landscape—just the speed. Built with the ultimate combination of aero efficiency, lightweight agility, and seamless integration, the OSTRO Gravel was made for riding fast and winning big. Put your head down and go.
Additional information
| COLOR | Gloss UD, White Grunge, Olive Green, HEritage Blue |
|---|---|
| SIZE | 49, 52, 54, 56, 58, 61 |
| WHEELS | BLACKINC 34, BLACKINC 45, NO WHEELS |
| BARSTEM | 360 – 80, 360 – 90, 360 – 100, 360 – 110, 360 – 120, 360 – 130, 360 – 140, 380 – 80, 380 – 90, 380 – 100, 380 – 110, 380 – 120, 380 – 130, 380 – 140, 400 – 80, 400 – 90, 400 – 100, 400 – 110, 400 – 120, 400 – 130, 400 – 140, 420 – 80, 420 – 90, 420 – 100, 420 – 110, 420 – 120, 420 – 130, 420 – 140 |
| GROUPESET | FRAMESET Premium package, SRAM FORCE + PM, SRAM FORCE XPLR + PM, SRAM RED XPLR + PM, SRAM RED + PM |
