Ceramicspeed asked this question and worked with the aerodynamics experts at Drag2Zero to find a solution. And the answer is: it is possible. An almost closed cage encloses the gear rollers and guide plates and ensures that the air flows unhindered. Furthermore, turbulence during braking is avoided. Numerous wind tunnel tests have shown that air resistance has been reduced by up to 60% compared to conventional derailleurs. And for all those who like to stand out, the OSPW derailleur cage system features pinstripe graphics, which visually ensures high speed. Ceramicspeed's proven oversized pulley system continues to operate under the "cover" and provides a significant reduction in friction. Large rear derailleur pulleys with 15 teeth at the top and 19 teeth at the bottom significantly reduce movement of the chain links as they pass through the cage, resulting in less drag. Additionally, the enlarged gears offer longer life than other standard systems on the market. Probably the most interesting innovation, however, are the rollers: the teeth, which rest on an aluminum disc, are made of a durable, fiber-reinforced composite material. This ensures that the chain runs very quietly and smoothly. However, the most important goal of the development work was to avoid contamination in the bearing area, which is exactly what the patent-pending Active Debris Remover (ADR) system does. Directly on the contact surface with the ball bearing, the washer has a lamellar and toothed profile, which expels all dirt during movement and prevents dirt from getting inside in the first place. Additionally, the closed design prevents twigs or sticks from getting caught in the pulleys and causing possible damage to the cage. Ceramicspeed's high-quality ceramic-stainless steel hybrid ball bearings continue to rotate in the center. These have to compensate for a large amount of friction, since depending on the gear ratio they rotate 4 - 5 times faster than the crank, and therefore benefit in particular from a low-friction and durable bearing. Ceramicspeed SpeedBalls are 15% harder than competitive ones and can absorb much more force. They also have an incredibly smooth surface, thus minimizing rolling resistance. All these improvements have also increased the service life by a factor of 6. Compared to the already high-quality standard bearings from Ceramicspeed, the "Coated" version installed here has a very thin protective layer applied to the bearing rings. This makes them even more resistant, extends their lifespan by a further 60% and further reduces rolling resistance. Ceramicspeed ball bearings are therefore considered the best in the world. Ceramicspeed uses only the best materials and the latest production technologies to always guarantee the highest possible quality. All products are handmade in Denmark. No hydraulic presses are used during assembly. Manual assembly eliminates manufacturing tolerances and always ensures a perfect fit. To truly install only the best on your bike! The manufacturers at Ceramicspeed have confidence in their products and offer a lifetime warranty on this OSPW system.