Superlight Aero Race Bike

The OSTRO is an ‘everything’ bike, a quiver killer, a master of all trades. Searingly fast, incredibly light and supremely comfortable, it’s ready to win sprints, mountain stages and cobbled Classics. It’s the ultimate all-rounder because it refuses to compromise. If you’re the sort of rider who races with ‘the knife between your teeth’ no matter the parcours, this is the bike you’ve been waiting for. When we say you can have it all, we mean it.

Colour Options

Scroll for details

Detailed Aerodynamics

Every element of the OSTRO is optimised for aerodynamics.  The mid-chord aero profile tube shapes, the wide stance fork featuring our pioneering Reversing Flow Energising Channel, and the aero cockpit with fully integrated cabling. The net result is a superlight bike that is close to the aero performance of the ONE and ready to blitz the fastest road races.

The tube profiles are derived from NACA (National Advisory Committee on Aeronautics, the godfathers of aero) shapes, oriented along the waterline (horizontal) in line with airflow and optimised for ride quality and aero-to-weight balance by truncating the aero section aggressively.

As well as being lighter, stiffer and more compliant, these truncated aero sections also reduce drag in crosswinds and better accommodate bottles on the bike. In designing the OSTRO, Factor considered every aspect of the frame and applied the optimum aero profile, with particular regard to the transitions between frame sections (eg down tube to seat tube, fork and head tube to down tube) and to performance across a full range of effective wind angles.

Wide stance fork

The new wide stance fork features our highly innovative Reversing Flow Energising Channel. Both the channel and the fork’s wide stance address the aerodynamic challenge of incoming airflow meeting the ‘reversing flow’ of air carried by the wheel and tyre moving forwards through the fork. 

Full Integration

The one-piece, aerodynamic Black Inc Barstem reduces drag by meeting clean incoming airflow with a clean shape. Fully internal cabling brings further gains and Factor has achieved this while maintaining a 1⅛” top headset bearing for optimised frontal area, whereas many other brands increase the head tube size to accommodate internal cabling, cancelling out the benefits.




OSTRO Winners

Since its launch, the OSTRO VAM has proven its versatility with stage wins on some of cycling’s biggest stages

Dan Martin , Stage 17 Giro d’Italia 2021

André Greipel, Stage 4 Vuelta a Andalucía 2021

André Greipel, Challenge Mallorca 2021

Mike Woods, Stage 4 Tour de Romandie 2021

Mike Woods, Stage 2 Tour des Alpes Maritimes et du Var 2021

Dan Martin, Stage 3, Vuelta a España  2020

Super Lightweight

The OSTRO is an aero disc-brake frame which weighs just 780g (painted, size 54, Flicker design). For using the very best materials and reaching such a low weight for its class, the OSTRO carries Factor’s VAM designation. It easily builds to the UCI limit of 6.8kg, equipped with a power meter and mid-depth aero Black Inc FORTY FIVE wheels.

Finally, here is an aerodynamic race bike with no weight penalty. Few rides or race routes are exclusively mountainous or flat roads so, naturally, you want it all: speed and lightness. The OSTRO is the ‘everything’ bike, making you fast whatever the terrain.


The OSTRO is an aero race bike that’s ready for Paris-Roubaix. It’s a ground-breaker on the cobbles, whereas usually it’s the cobbles that break riders. Why be aero for Roubaix? Simple. It’s a 260km race that averages around 45kph and ends with a sprint in a velodrome. Any energy saved can make the difference to victory, and over that distance at that speed you can save a lot of energy. What’s more, the same applies to every single ride that you do.

The OSTRO achieves its remarkably smooth ride in three key ways: tyre clearance, ultra-thin seatstays, and carbon fibre layup.

Tyre Clearance

Tyre clearance of 32mm is huge for an aero race bike and it opens a world of possibilities. Take on the cobbles, the back roads or your longest ride ever. This clearance is enabled by the disc-brake-only design and wide stance fork.

ViSTA-Style Seat Stays

At the rear, the ViSTA-style pencil seat stays are designed to absorb road noise and cushion bumps. Furthermore, they meet the seat tube at a dropped angle which encourages the seat tube and seatpost to cantilever around the seat cluster to create an effective amount of controlled ‘travel’ at the saddle.

Carbon Layup

Factor has renowned expertise in carbon fibre, and because we own our factory we are able to iterate almost endlessly during the R&D phase of any project. For the OSTRO, the carbon layup was continuously refined in order to achieve a high level of frame compliance without sacrificing any of the power transfer efficiency.




A Perfect Partner – Black Inc FORTY FIVE

The new Black Inc FORTY FIVE wheelset is the perfect partner to the OSTRO, balancing aerodynamics, lightness, strength and stiffness. Its performance is driven by a proprietary rim profile. The FORTY FIVE is disc-only, tubeless-ready and optimised for 25-28mm tyres, with an internal rim width of 21mm. The new Black Inc hubs run on CeramicSpeed bearings and feature an aggressively machined, lightweight freehub. Available with all complete OSTRO builds and individually through Black Inc.

Geometry and fit

Handling and position geometry are standardised with other Factor models and virtually identical to the O2 and O2 VAM. Stack and reach progression is linear throughout the size range.

New mid-depth profile, lightweight seatpost balances weight and aero, available in 0 and 25mm offset options.

To give customers more choice, the OSTRO is compatible with the one-piece Black Inc Barstem for fully internal cable routing, and also with all separate bars and stems (cables enter below stem).




System Details & Design

Electronic shifting only

 In line with customer demand and enabling aero drag and weight savings, the OSTRO is built exclusively for electronic shifting groupsets

T47 threaded bottom bracket

Used for the first time in a Factor, the T47 standard ensures a secure fit and easy maintenance

Three different fork offsets

Ensures optimum handling characteristics across all frame sizes so that every customer has the best ride experience


The Factor OSTRO

The Factor OSTRO is named after one of the eight principal winds of the Mediterranean Sea. OSTRO is a southerly wind that sweeps through the Côte d’Azur. Of particular relevance this year, the OSTRO wind can blow through Nice, the Grand Départ of the 2020 Tour de France, where the riders required exceptional aerodynamic performance to negotiate the crosswinds on the fast coast roads as well as the climbing response of a super-lightweight machine for the surrounding climbs; the Factor OSTRO was created for exactly such mixed riding.





Factor OSTRO Options

Premium Frameset Package

$5,499.00 ex. tax

  • Frame and Fork
  • Integrated Barstem
  • Seat Post
  • CeramicSpeed BB
  • CeramicSpeed Headset
  • Accessories inc. bar tape + computer mount
  • Colours: Flicker, Chrome, Soho Mix
  • Shop Here

Factor OSTRO SRAM Red eTap AXS

$10,099.00 ex. tax

  • Factor OSTRO frameset
  • Integrated Barstem
  • SRAM Red eTap AXS
  • CeramicSpeed Headset & BB
  • Black Inc FORTY FIVE Wheelset
  • Selle Italia SLR Boost
  • Colours: Flicker, Chrome, Soho Mix
  • Shop Here

Factor OSTRO SRAM Force eTap AXS

$8,199.00 ex. tax

  • Factor OSTRO frameset
  • Integrated Barstem
  • SRAM Force eTap AXS
  • CeramicSpeed Headset & BB
  • Black Inc FORTY FIVE Wheelset
  • Selle Italia SLR Boost
  • Colours: Flicker, Chrome, Soho Mix
  • Shop Here



CSeat Tube Angle74.574737373
DTT (effective)511527550566582
EHT angle71.772.572.573.373.3
FFork Offset5348484343
GTrail (@683OD)57.157.357.357.557.5
IBB drop7272707070
JFront Center574575587591607
KFork length373373373373373


Frame SetFrameFactorOSTROTeXtreme®, Toray®, Nippon Graphite Pitch-Based Fiber
ForkFactorOSTROWide Stance Fork
Seat PostFactorOSTROZero and 25mm setback available
BarstemBlack IncVAMReach 80mm, drop 125mm. Multiple stem lengths and bar widths available
HeadsetCeramicSpeed1-1/8" and 1-3/8" bearings
Head Tube Diameter1-1/8" upper and 1-3/8" lower
BBCeramicSpeedT47AAluminium cups / CeramicSpeed bearings with Wheels MFG 24mm BBRight Reducers/Adapters
Max Tire Clearance32mm
Wheel Size700c
Brake TypeDisc
Front Axle12 x 100mm thru-axle
Rear Axle12 x 142mm thru-axle
Cable RoutingInternal
Finish/ColourFlicker, Chrome, Soho Mix
Manufacturer WarrantyLimited Lifetime Warranty
Select your currency
USD United States (US) dollar
EUR Euro