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Roval 321 Disc - Disc Brake

Making up about 50% of your total race time, the bike portion of a triathlon is where equipment choices 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 fiber and a honeycomb-foam filling, or a spoked wheel that's been faired with a carbon fiber cover. In our 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, we first designed our optimal aero shape and then worked on our internal stiffness targets to fit within what we consider to be a desirable frame stiffness.

And while light overall weight was a development priority, our focus was aerodynamics. Through hours of Computational Fluid Dynamics (CFD) and testing in the Win Tunnel, we developed a never-before-seen shape that's optimized to work with a tire 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 our 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, we've also added CeramicSpeed bearings and DT Swiss 240 hub internals into our hub. Each 321 Disc wheel is also 2Bliss Ready right out of the box and comes with a quick-release, and tubeless valve stem.

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.

Rider Reviews

  • 5
  • 2 Reviews

It's Good, It's Very Good!!

Woah, picked this puppy (Roval 321 Disc) up yesterday and took it for its first ride today... Quick! Very very Quick! The ride I had planned involved 1000m elevation over 120km and because I had a new toy I thought I'd slap it on the TT Shiv Disc and take the ridicule of having a Disc wheel in the hills from my mates. Ridicule stopped, after the first 20min climb. The Roval 321 felt a little heavier than the CLX64 on the climb, but not hugely. It didn't stop me riding with the first three riders and gave me the added bonus of the ""whop"" ""whop"" war drums when I got out of the saddle to attack. Coming off the scarp and heading home I had a couple of anxious moments on the descent due to cross winds... so this might take some getting used too... not the wheels fault, pure rider ability (or lack of). On the flat the wheel felt great accelerated well and cruised through when tracking at 38-45km/h... really well. Pretty excited right now, think I need a cup of tea, to contemplate what just happened! : )


Name:
Commuter J.

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When You Thought Venge Had No Room for Improvement...321!

Carter at Senoia Cycle Works converted my 2019 Venge into a TT Monster. ITU bars with DI2 shifters and the final Kicker was Roval Disc. It Climbs better than the Roval 64 while lining the bike up better in cross winds. Must Have to Go Faster With VENGE.


Name:
Tricredibles

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