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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.

占有您总赛程50%的自行车部分让铁三赛事中的装备选择有可能决定第一还是第五。而选择碟轮显然能够节省更多时间。传统形状的碟轮已经比普通轮子更快,我们的Roval 321碟轮却颠覆了传统设计,成为了更快的轮组。

碟轮通常有两大类——完全平面的,通过碳纤维和内置的蜂窝泡沫填充物构成,或者先有辐条的结构再加上碳纤维罩。我们在颠覆传统的尝试让321两面各采用单层1k碳纤维,最终在刹车边的位置相连。这样的碳纤维因为造价太高很少用于自行车零配件,但是拥有很多性能优势。它比其他叠层,例如3k和12k要轻得多,并且只能由经验丰富的碳纤维工匠来排布。这挺麻烦的,但是最终结果却值得付出,因为它带来平顺的骑行品质,并且是市面上最轻的碳纤维碟轮之一。在真实世界当中,这意味着它能够迅捷提速,并且在长距离骑行中不易疲劳。

刚性通常是碟轮世界中的“热门话题”,但是我们认为这是一个有趣的讨论点。因为通常都认为高效率的力量传递和高刚性是直接的正比关系,但是通过大量实际测试,我们发现事实完全不是这样。实际上我们最初打造的碟轮刚性太高,它不会与车架一同发生形变,从而造成刹车的剐蹭。这很可能会被认为是轮子太软,但实际上是因为轮子过硬。为了解决蹭刹车的问题,我们首先确定优化的空气动力学造型,然后确定我们内部的刚性目标,确保轮子与我们认为优秀的车架刚性目标相匹配。

轻盈的整体重量是我们研发的重点之一,但是我们最终聚焦的还是空气动力学。通过我们的流体力学计算和风洞测试,我们研发了这个类别中全新的造型,针对轮胎和装上车之后的气流优化。这最的结果是在非传动侧拥有我们目前的认知中所能达到的最破风的造型,传动侧在留出车轮偏移量和后拨工作空间的前提下我们所能获得的最优方案。

为了尽可能节约能量,我们还加入了CeramicSpeed培林和DT Swiss 240花鼓内件。每一个321碟轮都是准真空,并且附送带衬垫的轮组袋,快拆,真空气嘴和SwissStop Black Prince刹车片。

为全世界最不愿妥协的运动员而设计制造的321碟轮拥有我们先进的科技,在您与时间的赛跑中助您一臂之力。