Racing 5 road is the starting point. But the version bearing the "CX" acronym -saved for sports that dont like clean roads- hides the real true "invisible" novelty inside the hub: a double coating that seals the bearings base guarantees smooth performance & long life even under extreme conditions of use. Straight Aero spokes with a differentiated thickness of 20 at the front & 24 at the rear. Radial front wheel & Fulcrum 2:1 Two-to-One™ Spoke Ratio rear wheel. Dynamic Balance™ is also included & thanks to two enhanced spokes it keeps the rims gasket material in balance during wheel rotation. Medium profile 24mm rim with spoke reinforcements & shaped braking surface for a more powerful & adjustable braking. The all new Racing 5 CX wheels have a deeper rim upper bridge for easier clincher fitting. Racing 5 CXs are compatible with Campagnolo Shimano Inc. & Sram Co. transmissions.