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Roval Traverse 38 SL Fattie 650b 148

Roval Traverse 38 SL Fattie 650b 148

Part No. 30116-7327

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While there may be a linear relationship between increased tire size and increased fun, this relationship only holds true when wider tires are paired with the correct width rims. Having a three-inch tire mated to a narrow rim makes for a squirmy, poor handling experience, and when you’re on the hunt for additional fun, these characteristics are undesirable. Lucky for you, the new age of traction, stability, and speed has arrived—and its name is the Traverse 38 SL Fattie 650b with a 148 rear.

While our 30-millimeter Traverse SL is already wider than most offerings from others, the benefits of three-inch tires become more apparent with a proper rim interface. In search for the proper width, our engineers tested various iterations, from 30 to 45 millimeters, to determine where the sweet spot lies. What they ended up with is a 38-millimeter internal rim width that turns the Traverse 38 SL Fatties into descending machines.

A wide internal rim width endows riders with a variety of advantages that are exemplified even more with plus-sized tires. The extra width allows for more tire volume, translating into more supple ride qualities, and better support for the tire, meaning that you'll experience less "burping" when riding tubeless and a drastic increase in traction. After determining the proper rim width for the plus-sized application, we began designing the rim using the same low-weight, high-strength technologies used in the Traverse SL and the Control SL. With this, we started with our Zero Bead Hook design that effectively eliminates the biggest weak spot found in traditional rims, and topped it off by using high-modulus carbon fiber to keep the weight down to a respectable 1650 grams.

Each Traverse 38 SL Fattie is hand-built to our own alloy hubs with DT Swiss Revolution spokes. Inside our hubs, you'll find sealed cartridge bearings all-around, and a quick-engaging 54t DT Swiss star ratchet system in the rear, allowing you to power over rocks and roots without delay. And while machines do a decent job of building wheels, we choose professionally trained humans to build ours, as they catch various flaws that a machine would otherwise miss. You likely noticed that the 24-front/28-rear spoke count seems low for such a burly wheelset, but during testing we discovered that when built with 32 spokes, the wheels were too stiff, resulting in poor ride quality.

To further reduce the overall weight, the wheels also include the Roval tubeless plug system, which sheds an additional 50-grams-per-wheel compared to a rim strip. Finally, with the 110/148 variant, you receive all of the benefits that Boost spacing offers. By increasing the width of the front and rear hub flanges, and in turn, increasing frame and fork clearance and stiffness, you obtain a stiffer, stronger, and more durable system at a minor weight penalty.

If you’re headed into the plus-sized wheel market, pick yourself up a set of Traverse Fattie SL 38 650Bs and notice for yourself that Fatties don’t have to feel fat.

  • Rim Material: Carbon fiber
  • Rim Width: 38mm internal
  • Front Spoke Pattern: Radial/Three-cross (2:1)
  • Rear Spoke Pattern: Three-cross (1:1)
  • Spoke Count: 24-hole Front, 28-hole Rear
  • Spoke Type: DT Swiss Revolution
  • Nipple Type: DT Swiss Pro Lock hexagonal
  • Front Hub: Alloy body, 15x110mm thru-axle only—15mm end caps included
  • Rear Hub: CNC-machined alloy body, high-quality DT 350 internals and 54t quick engagement ratchet system cassette, includes SRAM XX1 11-speed freehub and 148 end caps
  • Bearing Type: Sealed cartridge
  • Assembly Method: Hand-built
  • Every wheel includes tubeless valve stems in order to make tubeless set-up a touch easier.
  • Total Wheelset Weight: 1,657g
  • Total Wheelset Weight: 1,657g

雖然增加外胎尺寸與騎乘的樂趣息息相關,但使用寬胎的前提是搭配正確的輪框寬度度。若用三吋胎搭配窄輪框,絕對會難以控制,騎起來相當掃興。幸好,同時具備牽引力、穩定性與速度的新世代輪組已然問世,那就是搭配148後花鼓的Traverse 38 SL Fattie 650b。

雖然Specialized的30mm Traverse SL已經比其他廠牌更寬,但若要突顯三吋胎的好處,就要搭配正確的輪框介面。Specialized的工程師為尋找適當的寬度,測試了30至45mm之間的各種尺寸,試圖從中找出甜蜜點。結果證實採用38mm內徑寬度,可讓Traverse 38 SL Fatties成為下坡時的神器。

較寬的輪框內徑對騎士很有助益,尤其是搭配大尺寸外胎時;因為額外的寬度可增加輪胎體積,造就更滑順的騎乘體驗,也提供輪胎更多的支撐力,可減少無內胎的「打嗝」現象,還可大幅提升抓地力。 Specialized決定大尺寸外胎所搭配的輪框寬度度後,便著手設計輪框,沿用Traverse SL和Control SL的輕量、高強度技術,再整合Zero Bead Hook無胎唇扣設計,有效排除傳統輪框的最大弱點,再搭配高模數碳纖維,讓重量降到1650g,相當令人佩服。

每款Traverse 38 SL Fattie都是手工編織,使用Specialized特製的鋁合金花鼓,搭配DT Swiss Revolution輻條。花鼓內全面採用密封式培林,後輪快速咬合54t DT Swiss星型棘輪系統,可在不減速的騎乘狀態下,直接壓過石塊、樹根等。雖然機器編織的輪組品質不差,Specialized依然雇用專業技師操刀,因為他們能避免機器的疏漏。您可能已經注意到如此紮實的輪組,只使用前24條、後28根輻條似乎太少,但測試過程中卻發現,32條幅軸反而會讓輪組過於僵硬,影響騎乘品質。

為進一步降低整體重量,輪組包含Roval無內胎專用栓塞系統,相較於內襯帶,每個輪組可再減去50g。最後,搭配110/148前後軸規格,還能具備Boost貫穿軸的所有優點。前後輪花鼓耳的寬度增加,就能提高車架和前叉的間距和剛性;稍微多一點重量,就能擁有更強韌、更堅固、更耐用的系統。

如您有意添購大尺寸輪組,請選擇Traverse Fattie SL 38 650B,就能實際感受到它的靈巧。

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