For years, Fulcrum has been challenging the notion of the old idiom 'train heavy, race light.' Fulcrum saw this less as a truism and more as an excuse for race-day wheel makers to create sub par, underwhelming wheels. So, to counter this old ideology, Fulcrum throws every engineering trick in its playbook at wheels like the Racing Quattro.
Starting at the rim, Fulcrum constructed the Racing Quattro from aluminum -- no surprise there. And while this alloy composition is both strong and lightweight, the wheel's high strength-to-weight ratio required a multi-step design approach. Let's start at the rim and work our way to the hub. In any discipline of cycling, wheel tension is paramount. Your wheels drudge by, bump after bump, and over time, this impact translates to the interface between the spoke nipples and the rims -- the eyelets. So, to counter this stress, Fulcrum employed its MoMag spoke mounting system in order to retain proper tension -- this accounts for the repeatedly raised surfaces at the undercarriage of the rim. Basically, MoMag eliminates the need for holes at the upper bridge of the rim. Instead, MoMag guides the nipples inside the rim, to the point of connection, magnetically. This simple system creates a greater uniformity, while also reducing stress points. Ultimately, the benefits speak for themselves. Compared to a standard spoke mounting, MoMag creates higher rigidity, a longer lifespan, greater spoke tension, and through the elimination of rim strips, less rotational weight. And as for the spokes, the Racing Quattro features double-butted steel spokes, while still retaining an aerodynamic profile.
Making our way down to the hubs, we find what Fulcrum calls its Dynamic Balance technology. The principle at work is relatively simple -- a balanced wheel is both a faster and stronger wheel. So, at the rear wheel, the Racing Quattro compensates for the freehub body with two oversized spokes on the non-driveside. The weight gain is beyond negligible, but the rotational dynamics are drastically improved. Further along these lines, the rear wheel has received Fulcrum's 2:1 technology. This system is the reason you'll notice the hub's having no flange on the non-drive and a flange on the driveside. Fulcrum found that the rotational force of pedaling resulted in flex of driveside spokes. This slackens rim tension and creates a net loss in energy. So, the solution takes form in a doubling of driveside spokes. Essentially, there are now two spokes performing the duties of one, and accordingly, energy dissipation has been nearly eliminated.
Going even further into the hub, Fulcrum made the Racing Quattro hubs with a svelte design. This feature plays directly into the requirements of road racing. Not only is the hub now more stable, but the oversized rear drive-side flange and body translate to heightened levels of rigidity and reactivity -- vital characteristics for jump-off-the-front racing and climbing. At both hubs, you'll also find Fulcrum's Anti-Rotation System and five axis hub at work. This sunken spoke design maintains a uniform tension at every point of the spoke, further reducing stress to the rim and spokes.
The Fulcrum Racing Quattro is available in the color Black and with either a Shimano/SRAM or Campagnolo compatible freehub. Please note that the Shimano freehub is compatible with Shimano 11-speed shift systems, and that quick-release skewers are included with every wheelset.