Buy now. Pay later on Fast Forward F9T Carbon Tubular Track Rear Wheel. Fast Forward F9T Carbon Tubular Track Rear Wheel: Full carbon track wheel with 90mm deep DARC profile rim & Sapim CX-Ray spokes. Comes with exclusive wheel bag, valve extension & lock ring. Darc: FFWD DARCtm technology is short for Double Arc which refers to the profile of the rim. The revolutionary DARCTM profile improves aerodynamics dramatically by reducing the drag. Air has the characteristic to stick to its surface & by creating a negative arc section the air will be compressed more at the positive section. This will increase the pressure just like on the topside of an airfoil. Increased pressure results in a faster airflow & less resistance on the wheel which reduces the drag. Carbon: We use High-Tensile TC-35 carbon for the majority of the lay-up. This gives the rim a very high strength with sufficient stiffness to cope with hard application of the wheels. So, rather than use a stiffer, but more brittle carbon type, we chose durability over ultimate stiffness. In some lay-ups we add some higher modulus sheets to increase stiffness locally. We actually use multiple layers of different types of carbon. Only the outer layer is made from a 3K weave. Underneath this layer are layers of UDF (Uni-Directional Fiber) sheets. A mixture of different angles to resemble a uniform material. Because carbon fiber can handle tension very well, we have to mix up the layers to make the rim stiff & strong enough. Superstiff High Tensile TC35 Carbon 90mm
- DARC profile FFWD decals under clear coat FFWD Track hubs Only available in Tubular version Weight: 1865 gram Sapim CX-Ray spokes, 28H, aero blade (0.9*2.3mm), lightweight, high fatigue-resistance Brass nipples Hand built in The Netherlands