Factor Ostro Carbon SRAM Force AXS Gravel Bike

Factor OSTRO Gravel with SRAM Force AXS E1 and Black Inc THIRTY FOUR wheels — a 950g carbon gravel race bike with 45mm tire clearance, built for all-road speed. The OSTRO Gravel is Factor’s carbon gravel race bike, built to carry road-bike speed onto mixed and unpaved terrain. This build pairs the frame with a SRAM Force AXS E1 electronic groupset and integrated power meter, plus Black Inc’s THIRTY FOUR carbon wheelset and Integrated Aero Barstem. At 950g, the frame is light for a gravel platform, with a 45mm measured tire clearance for aggressive gravel tires without giving up the bike’s road-derived aero shape. Factor uses a zoned aero strategy: the front of the bike, including a head tube shape engineered around the laminar separation bubble effect, is optimized for aerodynamics, while the rear prioritizes compliance and low weight. The frame supports the Universal Derailleur Hanger (UDH), which rotates rearward in a crash to protect the derailleur. In 2022, an OSTRO Gravel finished top-10 at Unbound 200, gravel’s toughest race, in a year when heavy rain made the course brutal. Who It’s For • Gravel racers and fast all-road riders who want a race-focused frame, not an adventure or bikepacking platform. • Riders who want a fully electronic drivetrain with an integrated power meter. • Riders comfortable with an integrated cockpit rather than a swappable stem and bar. • Not the best fit if you need rack or frame-bag mounts for loaded touring. What to Look For • Bottom bracket fit: standard cups are CeramicSpeed T47A aluminum, with optional CeramicSpeed bearings for DUB, 24mm, or Ultra-Torque cranks. • Cockpit sizing: the Integrated Aero Barstem (reach 80mm, drop 120mm) comes in multiple lengths and widths; as a one-piece unit, dial in fit before ordering. • Tire and wheel intent: 45mm measured clearance, with wheels tuned most aero around 32mm but effective to 43mm. Key Features Frame and fork: TeXtreme, Toray, and Nippon Graphite pitch-based carbon at 950g, with the OSTRO Wide Stance Fork. The zoned aero design puts aero priority up front and compliance at the rear, and UDH compatibility adds crash protection and wireless drivetrain flexibility. Groupset and shifting: SRAM Force AXS E1 with integrated power meter, 2x12-speed 48/35T crank, and 10-33T cassette. Routing is fully internal and electronic-only, so this frame is built specifically around wireless shifting. Braking and axles: Disc brakes with 160mm rotors front and rear, a 12x100mm front and 12x142mm rear thru-axle, and a max chainring of 52T. Wheels and tires: Black Inc THIRTY FOUR wheels use a 34mm rim depth and 25mm internal width, hookless with a secondary bead shoulder that helps hold tires seated on rapid deflation. Clearance is 45mm measured, most aero near 32mm but effective to 43mm. Cockpit: The Black Inc Integrated Aero Barstem uses a 7-degree flare below the shifter clamp, CFD- and wind-tunnel-refined shaping, chamfered tops for wrist clearance, and a built-in GoPro-style mount. Bearings and BB: CeramicSpeed SLT headset bearings at a 1.5″ head tube, and a CeramicSpeed T47A bottom bracket with cup options for DUB, 24mm, or Ultra-Torque cranks. Rider Intent Summary • Biggest strengths: A 950g aero-focused frame, fully electronic SRAM Force AXS E1 groupset with power meter, and a premium Black Inc wheel and cockpit package built for gravel racing. • Tradeoffs: The integrated cockpit and electronic-only routing mean less flexibility to swap in a different stem, bar, or mechanical drivetrain later. • What makes it different: A zoned aero frame paired with geometry tuned around tire size, giving fast handling on 43mm gravel tires and equally precise handling on 32mm road-style tires. Victory’s Take At Victory Bicycle Studio, we’d point riders to the OSTRO Gravel when they want a genuine gravel race bike rather than an adventure build, and we’d recommend a full bike fit given how much of its fit is set by the integrated cockpit.