Roval 321 Disc - Carbon Disc Rear Wheel

Disc wheels often fall into two categories—a completely flat shape, with structure coming from carbon fiber and a honeycomb-foam filling, or a spoked wheel that’s been faired with a carbon fiber cover. In Roval’s quest to break traditions, the 321 uses a single layer of 1k carbon fiber on each side of the wheel, and it all comes together at the brake track bridge. This kind of carbon fiber 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 fiber craftsmen. It’s complicated, but the payout 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 we 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, we’ve determined that this isn’t the case at all. In fact, our 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 first designed their optimal aero shape and then worked on their internal stiffness targets to fit within what they consider to be a desirable frame stiffness.

And while light overall weight was a development priority, Roval’s focus was aerodynamics. Through hours of Computational Fluid Dynamics (CFD) and testing in the Win Tunnel, they developed a never-before-seen shape that’s optimised to work with a tyre for on-bike airflow. What this translates to is an all-carbon disc wheel that, on the non-drive-side, has a shape that’s as aerodynamic as Roval’s current understanding allows, and a drive-side shape that’s as aerodynamic as the wheel-dish and derailleur clearance will allow for.

To save every possible watt, Roval have also added CeramicSpeed bearings and DT Swiss 240 hub internals into their hub. Each 321 Disc wheel is also tubeless Ready right out of the box.

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.