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Roval 321 - Rim Brake

Roval 321 - Rim Brake

Part No. 30018-8902

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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 321 disc turns conventional design on its head, creating the fastest wheel available.

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 long haul.

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 new-to-category 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 out of the box and comes with a padded wheel bag, quick-release, tubeless valve, and SwissStop Black Prince brake pads.

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.

佔鐵人三項比賽時間長達50%,自行車賽段的設備選擇,會決定您最後拿下第一名或是第五名的差別,沒有其他選擇可以比碟輪讓您省下更多時間。傳統形狀的碟輪比輻條車輪更快,但 Roval 321 碟輪更加創新,是地球上最快的輪組。

碟輪通常分為兩類,一類是完全扁平的形狀,結構為碳纖維和蜂槽型泡沫填充製成,或者用輻條再加上一層碳纖維蓋讓整體扁平的碟輪。為了打破傳統,321 在輪圈的每側使用一層 1k 碳纖維,並且全部連動到制動軌道橋上(brake track bridge)。這種製成由於成本高,很少應用在自行車零組件上,但它具有強大性能優勢。這種令人垂涎的碳纖維比其他碳疊層(如 3k 和 12k)輕盈得多,而且只能由最熟練的碳纖維工匠鋪疊。工序複雜,但這一切是值得的,因為它提供了穩定的支撐感而且是最輕量的碟輪。在現實應用時,代表它能夠高速旋轉,並減少征服賽道的疲勞。

堅硬程度通常是碟輪世界中的"熱門話題",但我們認為這非常有趣。長期以來人們認為,要有高效的功率傳輸就必須要使用堅硬的輪組,但通過大量的實地測試,我們確定情況根本不是這樣。事實上,我們最初的碟片非常堅硬,在加諸動力時不會有任何彎曲,但反而給制動處帶來摩擦。這給我們一種輪圈具有彈性的錯誤感覺,但實際上車輪過度僵硬。為了解決制動處摩擦的問題,我們首先設計了最發揮空力優勢的形狀,然後調整碳纖維疊層的剛性,以達到我們認為最理想的碟輪設計。

雖然輕量排在研發的優先順序第一位,但我們的重點是保持空氣力學優勢。經過數小時的流體力學計算(CFD) 和風洞測試 (win tumnnel),我們開發出前所未有的形狀,經過優化,與輪胎配合使用可以達到完美的空氣流動。成果是一個在非驅動側達到最佳空氣力學;在驅動側也能將飛輪、後變速器的擾流效果最優化的全碳纖維碟輪。

為了節省您寶貴的功率,我們還在花鼓中使用Ceramic speed陪林以及 DT Swiss 240 hub internal。每個 321 碟輪都是 2Bliss ready,隨貨附上含有襯墊的攜型袋、快拆軸,和無內胎氣嘴,SwissStop Black Prince 剎車塊。

為世界上最不妥協的運動員設計,媲美頂尖工程學,321 碟輪是世界上最先進的碟輪,讓您超越極限打破個人紀錄。

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