ARC 1400 DICUT 50: The Aero wheelset for varied and tight courses that require excellent handling.
The new ARC 1400 DICUT wheels with the AERO+ rim profiles also feature the new 1400 DICUT aero hubs. Available as disc brake version in three different rim heights (80 mm, 62 mm and 50 mm) the wheels set a new standard in aerodynamics and handling. In close cooperation with the aero experts from SWISS SIDE, a lower wind sensitivity in crosswinds and an improvement of the overall aerodynamics of the wheels could be achieved. In moderate crosswinds, the rider benefits from the propulsion provided by the sail effect as well as from a stable aerodynamic position with full control of the bike. High quality DT Swiss Aero spokes and the lightweight 240 DICUT Aero hub with the reliable Ratchet EXP system for direct drive complete this wheel set.
Reborn Faster - the new ARC wheels
Designed with a holistic approach to achieve a single thing: speed! DT Swiss believes in the art of engineering and strives for perfection in the development of new products. The guiding principle is to push the technological boundaries further and further.
Aero+ - The symbiosis of drag, handling and efficiency.
TRANSLATIONAL AERODYNAMIC DRAG
Drag is the aerodynamic force that hits the cyclist in the direction of travel and slows him down. It depends on the speed and the surface of the cyclist's body (75%) and of the bike and its components (25%). To minimize this translational air resistance, the contact surface of the entire system must be minimized.
In order to achieve higher speeds, the air resistance of the entire system consisting of rider and road bike must be minimized. This is because air resistance increases exponentially in relation to speed. From 15 km/h onwards, the air resistance is the greatest force that can be overcome. Since the front wheel contributes 8% of the total air resistance, the behavior of the wheel plays a significant role.
In crosswinds, racing cyclists and their racing bikes are exposed to lateral forces that influence their riding behavior. When developing wheels for road bikes, the goal is to minimize these lateral forces and to provoke a sailing effect - this combined with the best rideability. You can imagine this sailing effect like a sailboat whose sail catches the wind and propels the boat.
When cycling, the rim has the same effect and can push the whole system forward. The big advantage in moderate crosswinds with angles of attack between 0° and 20° is that the cyclist is no longer slowed down by the translational drag, but benefits from the reduced drag. Depending on the height and shape of the rim, the air resistance can reach negative watt values, which even causes forward propulsion. Excellent sailing effects in crosswinds occur with increasing angles of attack of up to 18°. In addition, there is a stall, which causes the air resistance to increase again.
ROTATIONAL AIR RESISTANCE
The rotating parts of the bicycle, such as the wheels, not only move forward at a certain speed, but also experience rotational air resistance. The rotational air resistance can be described as the additional friction that occurs when the impeller with the rotating components cuts through the air. Rotational drag accounts for up to 25% of total drag compared to 75% of translational drag. Since the spokes are the load-bearing connecting element between rim and hub, they are particularly important in the fight against the wind.
Important to know: The lower the height of the rim, the less the influence of the sailing effect. Longer spokes at low rim heights lead to a higher rotational air resistance.
Crosswinds generate forces on the wheel and can have an influence on the drivability. Therefore, the driving behavior must be safe and predictable regardless of external weather conditions such as strong and changing cross and headwinds. To maintain control of the bike at higher speeds, the AERO+ rim should have the lowest possible steering torque.
The racing cyclist therefore benefits from a predictable and therefore controlled steering behavior, stays longer in the aerodynamically optimal position and reaches higher speeds.
WHY IS THE STEERING MOMENT SO IMPORTANT?
The racing cyclist feels lateral forces that occur during a bike ride due to side winds and passing vehicles (similar to gusts of wind) of different sizes and speeds. They can have a strong influence on the wheel and are sometimes unpredictable and dangerous for the cyclist. The larger the angle of attack (Yaw) and the stronger the wind force, the more the cyclist must constantly adapt to the counterforce required to ride straight ahead in the desired direction.
PHYSICAL EXPLANATION OF THE STEERING TORQUE
An asymmetrical distribution of the force acting on the front wheel in a crosswind generates a steering torque.
WHAT DOES THIS MEAN IN DETAIL?
The lateral force distribution on a wheel rim is asymmetrical in a cross wind. This asymmetry generates a moment (steering torque) around the steering axis - the axis around which the wheel and fork rotate when steering. One of the development goals of the new AERO+ rim shape was to minimize this asymmetry by distributing lateral forces evenly on the rim in crosswind conditions. This was achieved by means of CFD (Computational Fluid Dynamics) simulations and confirmed by wind tunnel tests.
Rolling resistance is about more than just the forces that need to be applied to roll on different surfaces or to overcome obstacles. Wider inner rim dimensions and wider tires support driving characteristics such as traction and comfort. Wider tires tend to have a positive influence on rolling resistance. Due to their larger volume, they have a wider contact area and can be driven with less air pressure without the risk of getting a flat tire. While narrow tires have a longer and narrower contact area, the contact area of wider tires is "shorter". As a result, modern tires roll better due to the easier deformation of the carcass and the contact patch - the rolling resistance decreases.
Tubeless tires offer some decisive advantages over the conventional combination of tire and inner tube: The tire can be driven with less pressure without risking "snakebites" and therefore offers more grip. The lower pressure also ensures greater driving comfort. Dispensing with the inner tube means that there is no friction between the tube and the tire and that therefore the rolling resistance is lower when driving off-road and over obstacles. If tubeless milk is also used, the tire is also immune to punctures and small cuts. A great advantage for all those who like to ride long distances and away from the nearest bike store.
Tubeless Ready rims from DT Swiss have further advantages over conventional rims. Thanks to the design of their cross-section, the tire simply pops into place when inflated, so that usually only a normal stand pump is needed. The ingenious tread pattern of DT Swiss rims also ensures that the tire fits precisely and securely, even under tough driving conditions.
The perfect fit
The profiles of DT Swiss rims are specially designed for tubeless use. They guarantee a perfect fit and make the installation of the tire as easy as possible. Nevertheless, it is always possible to use a conventional combination of tire and tube.
DT Swiss Valve
The use of aluminum saves 40% weight compared to conventional brass valves. The integrated valve tool in the valve cap saves time and effort in finding the right tool for removing the valve insert. The conical valve base ensures a tight fit. The DT Swiss Tubeless valve fits perfectly to DT Swiss rims and ensures a perfect seal for long trouble-free rides.
DT Swiss Tubeless Band
The DT Swiss Tubeless Ready Tape seals the rim and also functions as rim tape. It is available in different sizes to fit perfectly to the different inner widths of the rims.
The DT Swiss Tubeless Ready Kit
The DT Swiss Tubeless Ready Kit is used to seal the Tubeless Ready rim and thus enables tubeless riding. DT Swiss strongly recommends the use of a high performance tire sealant even when using tubeless specific tires. When using Tubeless Ready tires, the use of the sealant is mandatory (the sealant seals the tire, which is primarily not airtight). A tubeless structure reaches its full potential only with a sealant! The sealant must be compatible with the rim, rim tape and tire. It must not be corrosive or aggressive in any way. In case of doubt, contact the sealant manufacturer so that you do not lose your DT Swiss warranty.