Fulcrum Wind 55 DB

Description

The power of aerodynamics.

In describing a racing bike wheel like Wind 55 DB, you start with aerodynamics: it’s time to try out on your bike how a finished and optimised profile down to the finest detail is able to make the difference.The 55 mm full carbon unidirectional rim, a full 27 mm wide, is the result of an endless cycle of tests, wind tunnel analyses and laboratory finishing.

Technologies

2-WAY FIT™
Fulcrum has developed its 2-Way Fit™ technology to ensure the perfect compatibility of the tubeless rims with normal clincher tyres and tubes. 2-Way Fit™road bike wheels are perfectly multipurpose for tackling every situation. Thanks to a special impression in the valve area, the tubes are fitted with maximum precision while keeping the tube perfectly stable inside the tyre. Housing the valve for tubeless tyres is also risk-free, with the unquestionable advantage that there are never any air infiltrations caused by non-ideal positioning when fitting.

RDB™ Rim Dynamic Balance
The concept is simple and elegant: balance the weight of the gasket, with an item of similar weight placed on the exact opposite side. When making carbon bike rims, the pieces of carbon fabric are aligned in such a manner that the resulting rim is always balanced.

DRSC™ - Directionated Rim-Spoke Coupling
Exclusive rim/spoke coupling system. It allows the rim, spokes, nipples and hub to align properly with the same tensioning value in all areas.

MOMAG™
A magnet and lots of ingenuity. This was what led to the patent for the well-tested “Mounting Magnet” system, or MoMag™. The nipples, once inserted inside the rim via the valve hole, are “guided” to the point of connection with the spoke by means of the magnet. This simple but ingenious system makes it possible to have wheels without holes on the upper bridge but with spokes tensioned by traditional nipples! No holes on the rim mean that the rim is uniform at every point, free from stress points or zones of weakness and, for the clincher profiles no rim tape is required, to the benefit of weight reduction. The advantages are immediately clear: greater rim lifetime, greater resistance to fatigue, the possibility to give the spokes greater tension, and greater stiffness which, in terms of performance, means greater reactivity and acceleration.

Anti-Rotation System™
This new system raises the concept of spoking to a new level of performance for road bikes and triathlon wheels (and mtb too). The Fulcrum® engineers have redesigned the spokes and the hub housings to create a solid and unmoveable whole. The result is that the spokes will never lose their initial tension, thus keeping the wheel perfectly reactive and centred. They also will remain in the position that has been studied in the wind tunnel tests to ensure the best aerodynamic penetration possible.

AFS-Axle System™
The Axial Fixing System™ is the solution developed by Fulcrum® to fix the disc brake to the hub. The constraint granted by the butt area of the release mechanism, greater than in familiar standard ones, makes it possible to obtain greater structural rigidity and therefore more precise and powerful braking.

Rim Full Carbon Technology
Full carbon Fulcrum® rims are built using combinations, developed in the laboratory, of different types of fibre, including UD and the famous 90-degree 3K of models at the top of our range. To build them Fulcrum developed a special HTG (high transition grade) resin, whose glass transition point is at a higher temperature than any other fibre used in the bicycle industry. This gives incomparable performance when braking.

Wide Rim Tech
Fulcrum® has worked to create rims that are wider than before, about 4 mm or more than previously. This technical choice provides an ideal basis for 25/28mm tyres, the sizes currently popular. This ensures stability, excellent handling and superior comfort.

Undrilled Rim Bed
No holes on the bridge connector mean that the rim is uniform at every point, free from critical areas subject to stress. The advantages are immediately clear: less weight, longer-lasting rims, greater resistance to fatigue, the possibility of giving the spokes more tension and more stiffness which, in terms of performance, means improved responsiveness and acceleration.

Specification