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Factor announces 2021 Ostro | New ‘super-light aero race bike’

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Issue broadcasts 2021 Ostro | New ‘super-light aero race bike’

Issue has formally introduced its new all-round, light-weight aero bike, the Ostro.

Not too long ago spotted by BikeRadar at the Criterium du Dauphine, the bike has since been used by Israel Start-Up Nation team riders through the first week of the 2020 Tour de France.

As we speculated initially, the Ostro incorporates options from Factor’s One aero road bike and its O2 VAM lightweight climbing bike, to make one all-round bike that Issue says is ‘able to win sprints, mountain phases and cobbled Classics’.

Alongside the brand new Ostro frameset, Issue has additionally introduced a brand new set of Black Inc wheels, the Black Inc Forty 5. Just like the Ostro, Issue says this new tubeless-ready wheelset is optimised to be each light-weight and aerodynamic.

No compromises

Persevering with a giant pattern for 2020, the Ostro sees light-weight and aero bike options converge right into a singular package deal.

Graham Shrive, Issue’s director of engineering, explains its sponsored professionals have at all times requested for an aero bike with no weight penalty (or a light-weight bike with no aerodynamic compromises, to place it one other method), in addition to an aero bike that’s comfy sufficient for the cobbles of Paris-Roubaix and comparable races

So, as a substitute of making an attempt to construct particular bikes for every scenario (as Issue has completed beforehand), Shrive says Issue has focussed on making one bike that may do all of it.

Factor Ostro

The Issue Ostro is already being utilized by Israel Begin-Up Nation on the Tour de France, with climbers like Dan Martin driving it through the mountainous first week.
Jered and Ashley Gruber

Issue Ostro key options

  • Claimed 780g body weight (dimension 54cm, Flicker paint job)
  • Truncated aerofoil tubing all through
  • A large stance fork that’s aerodynamically optimised for 26mm tyres however has clearance for 32mm tyres
  • A seatpost and rear finish tuned for consolation 
  • ‘Weight impartial’ totally inner cable routing
  • Digital shifting and disc brake solely
  • T47 threaded backside bracket
  • Equivalent geometry to the Issue O2 and O2 VAM

It’s light-weight

Key to the Ostro’s light-weight credentials is its claimed 780g body weight for a dimension 54cm, with the Flicker paint job (which is actually a transparent coat over carbon with painted graphics).

That’s 20g lighter than the brand new Specialized S-Works Tarmac SL7 body (although given this stuff are at all times topic to small error margins, we’d say that’s about even), and solely 100 grams or so heavier than Issue’s personal, lately up to date O2 VAM lightweight climbing bike.

Factor Ostro

The Flicker paint job is the lightest Issue gives. The carbon construction of the bike may be seen beneath the clear coat lacquer.

Trek’s new light-weight aero bike, the Emonda SLR is outwardly able to hitting sub-700g figures for an unpainted body, however Trek doesn’t specify what dimension that applies to, so it’s barely more durable to make comparisons.

Whoever really wins within the lightweight-disc-only-aero-bike wars, Issue says the important thing factor is that the Ostro can ‘simply’ be constructed to the weight restrict of 6.8kg for bikes utilized in UCI-sanctioned occasions, even when outfitted with an influence meter and its new mid-depth Black Inc Forty 5 wheels.

…and aero

As anticipated, the Ostro doesn’t use the wild, split-downtube design seen on Issue’s One aero bike, and as a substitute makes use of extra conventional truncated aerofoil tubes all through the body.

Initially seen on Trek’s Speed Concept time trial bike way back in 2009 (Trek referred to as them ‘Kamm tail’ digital aerofoils), the idea is that they trick the airflow into appearing like there’s a a lot deeper aerofoil current, but enable bike designers to remain inside the UCI’s strict laws of bicycle tube styles and sizes.

Factor Ostro

The Issue Ostro has a large, truncated aerofoil formed downtube.

The truncated aerofoil tube shapes additionally are likely to show significantly better stiffness and weight traits than extra conventional aerofoil shapes, as they’ve bigger cross sections. Due to this they’ve since change into de rigueur on street bikes that need to be each light-weight and aero.

This design convergence has led to a certain quantity of adverse commentary lately although, with many lamenting that ‘all bikes look the identical today’.

Usually, blame for this has been laid on the UCI’s door, however radical designs just like the Hope/Lotus HB.T observe bike and Issue’s personal One aero street bike, have proven that there’s nonetheless vital room for individuality in bike design, even inside the UCI’s design laws.

Extra integration and don’t neglect about consolation

Serving to it’s aero credentials, the Ostro additionally takes benefit of a totally built-in handlebar system, which suggests cables are routed utterly internally (as a substitute of being uncovered to the wind), though a non-integrated handlebar and stem will also be used (with cables routing beneath the stem).

Issue says its built-in system is weight impartial – that means it doesn’t add any weight in comparison with an externally routed cabling system – however it is just appropriate with digital drivetrain methods, equivalent to Shimano Di2, SRAM eTap or Campagnolo EPS.

Factor Ostro

The built-in handlebar routes all cables internally into the body, to cover them from the wind.

As talked about, the fork has a large stance design that’s stated to cut back the turbulence brought on by the rotation of the spokes within the entrance wheel, and in addition permits clearance for as much as 32mm tyres on wheels with a 21mm inner rim width.

This further tyre clearance, mixed with the Ostro’s new seatpost and skinny dropped seat stays, are what Issue says make it an aero bike able to taking up the cobbled classics too.

A race like Paris-Roubaix is 260km lengthy and is ridden at a mean pace of round 45kph, so aerodynamics will account for lots of power expenditure over the course of that race.

The fork additionally has what Issue calls a ‘reversing circulation energising channel’. It is a channel constructed into the underside of the fork crown, which is alleged to lower aerodynamic drag in that space by relieving the stress construct up as a consequence of ‘stagnant airflow’ created by the entrance wheel.

House mechanics can also be completely satisfied to know the Ostro has a T47 threaded backside bracket, which is actually a super-sized version of a traditional threaded bottom bracket.

There’s a lot to love about this bottom bracket standard, particularly from a user-serviceability viewpoint, however we’ve additionally beforehand argued that it’s a solution to a problem that shouldn’t exist.

Factor Ostro

The Ostro has a T47 threaded backside bracket and clearance for up 32mm tyres.

Issue Ostro builds and costs

The Issue Ostro is out there to pre-order now in two builds (with SRAM eTap wi-fi drivetrains) or as a frameset, in three totally different paint jobs; Flicker, Soho Combine & Sicilian Peach.

Issue Ostro with SRAM Pink eTap AXS

Factor Ostro SRAM Red eTap AXS

The Ostro with SRAM Pink eTap AXS is, as you’d count on, the costlier of the 2 builds.

  • Frameset: Issue Ostro
  • Groupset: SRAM Pink eTap AXS
  • Wheels: Black Inc Forty 5
  • Ending package: Black Inc built-in handlebar and seatpost, CeramicSpeed backside bracket
  • Value: £9,250 / $10,099

Issue Ostro with SRAM Pressure eTap AXS

Factor Ostro SRAM Force eTap AXS

This construct with SRAM Pressure eTap AXS makes use of the identical frameset, wheels and ending package because the top-of-the-range construct.

  • Frameset: Issue Ostro
  • Groupset: SRAM Pressure eTap AXS
  • Wheels: Black Inc Forty 5
  • Ending package: Black Inc built-in handlebar and seatpost, CeramicSpeed backside bracket
  • Value: £7,850 / $8,199

Issue Ostro frameset

Factor Ostro Frameset

The Ostro can be obtainable as a frameset, which incorporates the body, fork, built-in handlebar, seatpost and CeramicSpeed backside bracket.

  • Frameset: Issue Ostro
  • Ending package: Black Inc built-in handlebar and seatpost, CeramicSpeed backside bracket
  • Value: £5,400 / $5,499

New Black Inc Forty 5 wheels

Alongside the Ostro, Issue has additionally introduced a brand new set of wheels, the Black Inc Forty 5.

Tubeless-ready and disc brake solely, the brand new Forty 5 wheels by Issue’s sister firm Black Inc function 45mm-deep carbon rims, with an inner rim width of 20.7mm and an exterior rim width of 27mm.

In response to Issue, this implies the wheelset is optimised for 25-28mm tyres, with a 26.4mm Maxxis tyre (inflated width) being the ‘good’ dimension, aerodynamically.

Black Inc Forty Five wheels

The Black Inc Forty 5 wheels are optimised for yaw angles under 10 levels, as Issue says these are what riders truly expertise more often than not.

The wheels have 24 spokes entrance and rear, and the Black Inc HU-07 hubs run on CeramicSpeed bearings.

Primarily based on the NACA 0018 aerofoil form, the Forty 5 wheels have been designed primarily round what Issue describes as ‘real-world situations’.

Experiencing yaw angles (the angle of assault of the wind on a bicycle owner) above 10 levels whereas driving is, in keeping with Issue’s analysis, ‘very uncommon and never a use case for which efficiency in different situations needs to be compromised’.

Given this, Issue says the wheelset has optimised for yaw angles of 0-10 levels.

The Black Inc Forty 5 wheels can be found to pre-order now, at an RRP of £2,170 / $2,349.


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