Versatile and aggressive, these wheels are perfect for riders who enjoy putting themselves against a different type of route every day When it comes to racing bike wheels, 35 mm is not just a simple number. Thanks to the rim profile and the low rotational mass, The Racing Quattro is equally at home on both climbs as well as leading the pack on the flats. The Racing Quattro represents the family’s aluminum version that offers high performance and fun wherever you are! Features Rim material: Aluminium alloy. Internal width: 17 mm. Rim hight: 35 mm. Braking surface: turned braking surface. 21 Straight Pull spokes. Aluminum alloy nipples. Technologies 2:1 Two-to-One™ When you push on the pedals, the rotational force on the sprocket induces a slackening of the freewheel spokes with a consequent loss of rim tension. This results in undesirable flex of the whole wheel and an unavoidable loss of energy. Fulcrum® has solved this classic cycling problem with its 2:1 Two-to-One™ Spoke Ratio patent, by doubling the spokes in the critical zones. Anti-rotation system™ This new system raises the concept of spoking to a new level of performance for road bike 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 centered; will remain in the position that have been studied in the wind tunnel tests to ensure the best aerodynamic penetration possible. F.I.C. Fulcrum Identification Card 100% Handmade quality Right from its inception Fulcrum® has been marked by feature that continues to this day: that is to design, prototype and industrialise all the wheels characterised by the red “F”. Indeed these take shape inside of the R&D, the leading-edge department that represents the beating heart of the Italian company. Every single component of the wheel, the materials chosen and the technologies applied are the tangible result of the effort that Fulcrum® makes every day to give you maximum performance and reliability. To ensure the top performance and reliability of its products, each project, for the production stage, must undergo a series of very strict tests that validate what has been conceived and designed up to that moment (fatigue test, crash test, tyre burst test, enviroment test, 100% manually assembled and electronically checked). This is why, from its 2012 range, Fulcrum® wanted to supply each wheel with its own Identity Card (ID) which uniquely identifies the wheel and certifies that it has been manually assembled and has passed all tests required by the strict quality protocol.COMPATIBILITY CAMPAGNOLO Product code: R4-19CRBCCompatibility: CampagnoloRim material: AluminiumBraking surface material: AluminiumHub material: AluminiumRear wheel spokes: 21Rim width: 17cReal weight: 974 gCOMPATIBILITY SHIMANO Product code: R4-19CRBSRim material:AluminiumBraking surface material: AluminiumHub material: AluminiumRear wheel spokes: 21Rim width: 17cReal weight: 974 g