Technology

The HED Jet 180 is a radical rear wheel with a 180mm deep rim.

HED has introduced the Jet 180, a brand new rear wheel with 180mm deep rims.

The Jet 180 was designed particularly for athletes competing on the Ironman World Championships in Kona, Hawaii. Full rear disc wheels are banned within the Kona resulting from security issues in windy circumstances.

The 180 mm deep rim has a most outer width of 32.5 mm and an inside width of 21 mm.

It’s tubeless appropriate and out there in each rim and disc brake type. Claimed weight for the wheel is 1.229g in disc brake type or 1.258g in rim brake type.

HED hasn’t introduced pricing but, however notes that it is at the moment in inventory 4 to 6 weeks after order, and a restricted variety of wheels can be found on the 2022 Ironman World Championships in Kona.

How briskly is the HED Jet 180?

The HED Jet 180 rear wheel makes use of the deepest rim we have ever seen.
HED

On the time of this writing, HED has not launched any efficiency claims or knowledge evaluating it to different extra conventional aero wheels in its vary, such because the Jet 6 or Jet Disc.

Nevertheless, the aim of the wheel appears to be to imitate as a lot as potential the rim floor space of ​​a disc wheel, inside the limits imposed by the race organizers at Kona.

The tremendously elevated rim floor space of ​​disc wheels and rims prefer it helps improve aerodynamic effectivity in two methods, relying on how the wind hits them.

The huge floor space of ​​the rim is designed to optimize aerodynamic effectivity.
HED

In a headwind or crosswind, the deep edge or floor of a inflexible disc helps preserve airflow related to the wheel so long as potential. This reduces turbulent airflow and reduces friction.

In a tailwind or crosswind, the floor space of ​​the rim acts as a sail, serving to to propel the rider ahead extra effectively.

Can this rim be used on the entrance wheel?

The HED Jet 180 is on the market as a rear wheel solely.
HED

Theoretically sure, however HED solely presents it as a rear wheel for now.

Neither the ITU (Worldwide Triathlon Union) nor the UCI (Union Cycliste Internationale, world governing physique of biking) place any particular restrictions on the entrance wheel rim depth in particular person time trials.

CTT, the UK’s time trial governing physique, nonetheless places a restrict on entrance rim depth. Its guidelines state {that a} entrance wheel “should have not less than 45 p.c of its floor space uncovered,” however it’s unclear how this could be measured at an occasion.

Stable rear disc wheels are commonplace within the time trial world, however might we see even deeper rims on the entrance quickly?
Simon von Bromley / Prompt Media

Rules apart, the first challenge holding individuals again will probably be utilization issues.

An excellent-deep rim would possibly theoretically be quicker than a shallower one (all different issues being equal), but when it retains catching the wind stopping you from safely holding the optimum aero place on the bike, you will probably be slower. complete.

Nevertheless, at the moment’s wider and extra refined rim profiles usually provide a lot improved dealing with traits in comparison with rims of the previous.

Because of this, time trial and triathlon professionals routinely push the boundaries for incremental features.

Tremendous-deep entrance wheels like this unbranded Aerocoach AEOX Titan have gotten an increasing number of widespread in WorldTour time trials.
Simon von Bromley / Our Media

Aerocoach’s AEOX Titan entrance wheel with a 100mm-deep rim has been used extensively in recent times by among the world’s greatest time trial specialists equivalent to Filippo Ganna, Geraint Thomas and Wout van Aert.

It was even rumored that not less than one WorldTour crew was testing a entrance disc wheel for time trial use on the street, not ruling out the potential of utilizing it in a racing state of affairs.

So if HED makes this rim prepared to be used as a entrance wheel, you will be certain it will likely be of curiosity to these looking for marginal achieve.

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