Speed is synonymous with competition, and represents the ultimate in performance, above all when the stopwatch is the only means used to judge results on a racing bike.
The best of everything. And thus, the Speed 40 DB, 2-Way Fit (tubeless) + disc brake wheel is born. Speed 40 DB is a set of wheels for use with disc brakes that will simply leave you speechless, featuring a cutting-edge rim with a new shape, designed according to innovative technical concepts. At 26.5 mm, the wheel is wider, with an aerodynamic shape which includes a pronounced 8 mm profile and a "twill" weave carbon fibre texture, optimising the elastic responsiveness of the rim.
The final aerodynamic profile is the fruit of a lengthy finishing process: from simulations to prototype testing, in order to select the best design whilst taking the side wind and the turbulence created by the disc into account, followed by a long analysis to choose the best materials to be used on the final product.
Ultimately, the Speed 40 DB is the new point of reference for riders who have chosen to a disc brake, and who are looking for the very best wheels out there, with a true racing pedigree and a perfect mid-profile on the majority of routes.
2-Way Fit - 2-Way Fit profile for tubeless and clincher. Perfect compatibility of our tubeless rims with normal clincher types and tubes.
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.
USB - Ceramic Ultra Smooth Bearings - The hubs further enhance the triathlon and road bike wheels’ smoothness and reduce weight and the need for maintenance.
2:1 Two-To-One Spoke Ratio - Disc Brake- A system that is as simple as it is effective, the result of the ingenuity of Fulcrum® engineers and attentive observation of the results of the tests performed on the wheels on a daily basis.
MOMAG - A magnet and lots of ingenuity. This was what led to the patent for the well-tested “Mounting Magnet” system, or MoMag.
Anti-Rotation System - The Fulcrum engineers have redesigned the spokes and the hub housings to create a solid and unmoveable whole. The result is that the spokes
a) will never lose their initial tension, thus keeping the wheel perfectly reactive and centred b) will remain in the position that have been studied in the wind tunnel tests to ensure the best aerodynamic penetration possible.
Traceability - A guarantee of quality
AFS Axle 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 their range.
Wide Rim Tech- This technical choice provides an ideal basis for 25/28mm tyres, the sizes currently popular. This ensures stability, excellent handling and superior comfort.
Unrilled Rim Bed- No holes on the bridge connector means that the rim is uniform at every point, free from critical areas subject to stress.
Disc Specific Rim - Fulcrum is one of the first wheel manufacturers on the market to offer two completely different rim profiles from disc to conventional brake. So, no Its greater width makes it a perfect fit for tyres of 25/28mm upwards.
Plasma Freehub- The Plasma treatment makes the aluminium especially hard and resistant to surface abrasion and wear.
Oversize Flange - Transmiting every watt to the ground without dispersion, stiffening the wheel system where necessary, without having to add spokes or superstructures that increase weight.
2-Way fit (for clincher and tubeless)
Road / Triathlon
Rim Material Details
Full carbon, "Twill" - carbon fiber finishing
Front and rear: 40 mm
Inner Rim Width (Channel)
From 23 mm to 50 mm
Braking Surface/Brakes Options
Front Axle Compatibility
Rear Axle Compatiblity
Front Wheel Spokes
21, Two-to-one (14 left - 7 right)
Rear Wheel Spokes
21, Two-to-one (7 left - 14 right)
Stainless steel, double butted
Rounded, straight pull
Carbon, Aluminum oversize flange
Aluminum, Aluminum oversize flange
USB ceramic bearings. Adjustable Cup & Cones bearing system
Plasma treated HG freewheel. Aluminum Axle
109 kg (Cyclist)
HG11, Campy, XDr
About The Brand
Since 2004, Fulcrum has developed wheels for bikes with a sole, constant objective in mind: to deliver the best performance that modern technology can offer.