Roval 321 - the lightest and the most aerodynamic Triathlon lenticular wheel on the market
Making up about 50% of your total race time, the bike portion of a triathlon is where equipment choice can make the difference between first and fifth, and no other equipment choice will save you more time than a disc wheel. While traditionally-shaped disc wheels are faster than their spoked counterparts, the Roval 321 Disc for disc brakes turns conventional design on its head, creating the fastest wheel on the planet.
Disc wheels often fall into two categories — a completely flat shape, with structure coming from carbon fibre and a honeycomb-foam filling, or a spoked wheel that's been faired with a carbon fibre cover. In Roval's quest to break traditions, the 321 uses a single layer of 1k carbon fibre on each side of the wheel, and it all comes together at the brake track bridge. This kind of carbon fibre is rarely used in bicycle components due to its high manufacturing cost, but it offers a bevy of performance benefits. This coveted carbon is much lighter than other layups, like 3k and 12k, and it can only be laid by the most skilled of carbon fibre craftsmen. It's complicated, but the pay-out is worth it, as it delivers a supple ride and one of the lightest disc wheels available. And in the real world, this means that it'll spin-up quickly and reduce fatigue over the length of the course.
Stiffness is often the “hot-topic” in the disc wheel world, but Roval think it’s an interesting conversation. It's long been thought that efficient power transfer and high stiffness are directly correlated, but through extensive field-testing, they've determined that this isn't the case at all. In fact, the initial disc was so stiff that, under power, it wouldn't flex with the frame and this caused brake rub. This wrongly creates the perception of a flexy wheel, when really, the wheel is actually too stiff. In order to solve the brake rub problem, Roval engineers first designed an optimal aero shape and then worked on its internal stiffness targets to fit within what they consider to be a desirable frame stiffness.
And while light overall weight was a development priority, the main focus was aerodynamics. Through hours of Computational Fluid Dynamics (CFD) and testing in the Win Tunnel, Roval developed a never-before-seen shape that's optimized to work with a tyre for on-bike airflow.
To save every possible watt, they've also added CeramicSpeed bearings and DT Swiss 240 hub internals.
Designed for the most uncompromising athletes in the world, with engineering to match, the 321 Disc is the world's most advanced disc wheel for your race against the clock.
- Rim Type: Full carbon clincher, 2Bliss Ready.
- Rim Material: Carbon.
- Braking Surface: Disc brake only.
- Rim Depth: Solid Disc.
- Rim Width: 19 mm internal, 27.3 mm external (at brake track).
- Rear Hub: Roval Disc 142x12 mm, CeramicSpeed bearings, DT Swiss 240 internals, 11-speed.
- Assembly Method: Handmade.
- Driver body: Shimano HG.
- Extras: Roval padded wheel bag, Roval tubeless valve, QR and QR adapters.
|Disc rotor||Center lock|
|Real weight||1051 g|