Aware of the constant growth of e-bikes, with the E-Racing 4 DB Fulcrum has developed the first all-round wheelset specifically for this market segment. Fulcrum has achieved numerous successes in the E-MTB world in recent years and has applied the acquired technical know-how to the latest development of current bikes. Fast and extra rigid: The E-Racing 4 DB wheelset from Fulcrum In the development of the Rapid Red 5 DB, Fulcrum has brought together all the experience and technical know-how gained in the production of wheels for road bikes, and designed a model for surfaces other than asphalt. Unpaved roads, trails and dirt tracks require a wider inner channel - in this case 23 mm - with a low, extremely resistant 24 mm rim to absorb shocks and provide excellent riding comfort, whatever the stresses to which it is subjected. The tread pattern of the wheel allows the fitting of tyres between 30 and 46 mm with a wide range of settings that can be adjusted according to the type of road you ride on. The 24 straight-head spokes are supported by a solid aluminium hub, ideal for rough terrain and for the slightly higher weight of a touring bike. Get ready for your next journey: Your Rapid Red 5 DB wheels will be your loyal companion: comfortable and reliable, light and precise.Features - Fulcrum E-Racing 4 DB Solid aluminium wheelset for e-road and e-gravel bikes Can be converted into tubeless system thanks to 2-Way-Fit Ready technology Axial Fixing System™ to fix the disc rotor to the hub (Center Lock compatible) Extra hardened materials take into account the greater loads caused by the motor The inner width of 22mm makes it possible to mount tyres up to 45mmProduct features Use: e-road and e-gravel bikes Model: E-Racing 4 DB Wheel size: 28" Rim height: 34mm Rim width: 27.1mm Inner width: 22mm Rim type: Clincher Tubeless system: Yes, convertible Recommended tyre width: 30-45mm Brake Type: Disc Brake Disc brake standard: AFS (Center-Lock) Disc Over Locknut front: 12 x 100mm thru axle Over Locknut rear: 12 x 142mm thru axle Bearings: Sealed cartridge bearings Spokes: front 24 / rear 24 ASTM Category: 2 Weight limit: 135kg (rider, bike, equipment and luggage)Weight: 1870 gMaterial Rim: Aluminum Front Hub: Aluminum, Aluminum flanges Rear Hub: Aluminum, Aluminum flanges Spokes: Stainless steel, double butted Nipples: AluminiumTechnologies 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. 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. 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. Asymmetric Rim The asymmetry is designed to improve rim tension, balancing the forces from brakes and sprocket cassette. 2-WAY FIT™ Ready The wheelset can be converted into a tubeless system. The conversion is only permitted for certain types of tyres. For more information, visit the Fulcrum website. REINFORCED HEAD SPOKES For the new E-Mtb Fulcrum range, only oversize spokes, with a specific reinforcement design on the heads, will be used: this makes it possible to have the best quality of response to stress both in terms of resistance and in terms of transfer of the propulsive power. The technical refinement does not stop here. Changes were made to the profile too, which in some versions is variable. An elaborate section, which varies from 2.2 mm of the head to 2/1.8mm in the thinnest point, makes it possible to save the very important grams without affecting performance. REINFORCED FREEHUB SYSTEM The drastic increase of power and jerks, due to the intervention of the motor, made it necessary to use a freewheel body with tempered steel dedicated gears, which are able to withstand a breaking tension by 30% greater. The laboratory analysis observed the behaviour of the individual ratchets on cycles greater than one billion of uses: the carburised steel ensures an estimated lifetime that is 4 times longer compared to the Ergal model used for the non-E-Mtb models.