With a background in producing mechanical molds for the automotive and aeronautics sectors, French manufacturer Corima branched into the cycling arena by launching its first disc wheel in 1988. Its wheels quickly caught on with track cyclists and road racers around the world, as the manufacturing precision and composite expertise was noticeably superior to anything that its competitors were making at the time. The tradition of pushing carbon boundaries hasn't let up for Corima, as its years of composite know-how and constant innovations continue to set records and propel cyclists to victory in the most renowned races on the planet. An integral part of this success is derived from each of Corima's wheel components being built in-house. For the new Viva MCC 'S' Tubular Wheel, this is no exception. The hubs, spokes, and rims used to build this lightweight tubular 'system' were all manufactured under the same roof in its Southern France facility.
As one of three sets of wheels Corima builds that rely on its proprietary 12-carbon-spoke design, the new Viva MCC 'S' wheels perfectly illustrate what is attainable in tubular construction when carbon composites are pushed to the limits. Corima chose to apply its 32mm Viva rim profile to the wheelset, as this shape has been proven to be one of its most versatile. After all, it's light enough to be used on the steepest of climbs, it spins up fast on the flats, and it remains exceptionally stable in crosswinds.
For the construction of the Aero rim, Corima used pre-impregnated sheets of 3K (3000 filaments per square weave) carbon fiber for the wheel. These sheets were then formed into its torsion box 'Concept 2D' shape, which results in a subtle 'U-shaped' profile with a moderate 22.6mm width. And, besides lending itself to Corima's signature refined gloss and apparent carbon weave finish, this layup design also provides heightened levels of aerodynamics, stiffness, and ride quality compared to more traditional 'V-shaped' wheel profiles. This shape was the result of extensive CAD designs and wind tunnel testing, where Corima's engineers optimized friction pressure on various surfaces of the wheel and tire system. And, according to Corima, more than 60 prototypes were designed and tested before the final design was chosen for real-world road testing. Throughout all of these revisions, Corima ultimately discovered that by applying this specific width-to-height ratio, aerodynamics were able to be improved without sacrificing any strength.
Equally important to the overall ride quality, and perhaps the biggest contributor to the Viva MCC 'S' wheels' feathery weight (around 1090g for the set), is the proprietary 12-spoke design. Corima built the wheels with just six evenly-spaced pre-impregnated carbon spokes per side. This design is not only incredibly stiff, but also much lighter than steel spokes. This is primarily due to the process of bonding the spokes to the rim, entirely eliminating the need for a spoke bed. The 12 conical TOP (Total Optimized Propulsion) spokes are both over-molded and bonded with structural epoxy adhesives, ensuring that they're able to handle even the most demanding of road surfaces. This is the minimum amount of spokes allowed by the UCI, thus making these wheels as aerodynamic and lightweight as possible.
Separating itself from Corima's other two 12-spoked MCC wheel models, the Viva MCC 'S' wheels rely on chrome-plated aluminum hubs. The latest 'S' version of its aluminum hubs were built with both titanium and aluminum in order to create a stable, lightweight platform. On the rear wheel, three tempered steel transmission pawls were spaced at 120 degree intervals within a 30-tooth ratchet ring. This ensures a fast and smooth engagement the moment that you apply pressure to the pedals.
The Corima Viva MCC 'S' Tubular Wheel is supplied with brake pads, quick-release skewers, and a wheel bag. One of the front spokes -- as indicated by a sticker -- features an integrated magnet that is compatible with most modern computers. The wheel is available in the color Black/white and in 700c size. Additionally, you're able to choose from either Shimano/SRAM or Campagnolo compatible freehub body. Please note that these wheels are sold individually, and that the Shimano/SRAM freehub is available in both a 10- and 11-speed freehub compatibility.