Ceramicspeed asked themselves this question and collaborated with aerodynamics experts from Drag2Zero to find a solution. And the answer is: it is possible. An almost closed cage encloses the derailleur pulleys and guide plates and ensures that air flows unobstructed. Furthermore, braking turbulence 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 love to stand out, the OSPW derailleur cage system features a chalkboard graphic, which visually guarantees high speed. The proven oversized pulley wheel system from Ceramicspeed continues to operate under the "cover" and ensures a significant reduction in friction. The large rear derailleur pulleys with 15 teeth on the top and 19 teeth on the bottom significantly reduce chain link movement as they pass through the cage, resulting in less resistance. Furthermore, the widened gears offer a longer lifespan compared to other standard systems on the market. However, the most interesting innovation is probably 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. Yet, 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 primarily prevents dirt from penetrating inside. Additionally, the closed design prevents twigs or sticks from getting caught in the pulleys and causing potential damage to the cage. Ceramicspeed's high-quality ceramic-stainless steel hybrid ball bearings continue to rotate at the center. These must compensate for high friction, as depending on the gear ratio they rotate 4 - 5 times faster than the crank, and therefore particularly benefit from a low-friction and durable bearing. The Ceramicspeed SpeedBalls are 15% harder than those of the competition 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 Ceramicspeed's already high-quality standard bearings, the "Coated" version installed here has an ultra-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 finest materials and the latest manufacturing technologies to always ensure the highest possible quality. All products are handmade in Denmark. No hydraulic presses are used during assembly. Manual assembly eliminates manufacturing tolerances and always guarantees a perfect fit. To install only the very best on your bike! Ceramicspeed manufacturers have confidence in their products and offer a lifetime warranty on this OSPW system.