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Roval 321 Carbon Tubeless Rear Disc Wheel
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Roval 321 Carbon Tubeless Rear Disc Wheel
Item #WHL10206
Condition:
New with Warranty
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Why We Love It
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 the 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 Specialized thinks 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, 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, Specialized first designed an optimal aero shape and then worked on the 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 focus was aerodynamics. Through hours of Computational Fluid Dynamics (CFD) and testing in the Win Tunnel, Specialized 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 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, they've also added CeramicSpeed bearings and DT Swiss 240 hub internals into the hub. Each 321 Disc wheel is 2Bliss Ready right out of the box and comes with a 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.
About This Item
- Rim: 321 Disc, Carbon Clincher, 700c, Disc Brake, Tubeless Compatible
- Rim Details: Solid Depth, 27.3mm External Width, 19mm Internal Width
- Hub: Roval Disc hub, DT Swiss 240 Star Ratchet Internals, 142x12 thru axle compatible, (Convertible freehub and endcaps)
- Bearing Type: Ceramic Speed
- Spokes: Full Carbon Disc
- Tire Size: 22mm - 38mm - Max Pressure: 130 psi
- Weight: 1015g
- System Weight Limit: 240lbs / 109kg - Roval tubeless plugs and tubeless valve, Roval valve pocket covers
Specifications
Details
| Brand | Roval |
| Model | 321 Carbon Tubeless Rear Disc Wheel |
| Size | 700C |
| Wheel Orientation | Rear Wheel |
| Material | Carbon |
| Type | Road Wheels |
| Rim Type | Tubeless |
| Rear Axle Spacing | 12x142mm |
| Rim Inner Width | 19 mm |
| Rim Outer Width | 27.3 mm |
| Freehub Body | Shimano |
| Speed | 10-12 |
| Hubs | DT Swiss 240 Star Ratchet Internals |
| Brake Type | Disc Centerlock |
| Valve Type | Presta |
| Skewers | Skewer Not Included |
| Intended Use | Road |
| Weight | 1031 grams |
| mpn | 30021-8932 |
| upc | 888818733439 |
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