Ceramicspeed Ospw Rs Alpha For Shimano 9250/8150

• Area of application: Road bike
• Cage material: Carbon, polyamide
• Bearing material: Ceramic, stainless steel

The Oversized Pulley Wheel System (OSPW) from Ceramicspeed is probably the most sophisticated way of optimizing performance. The oversized derailleur pulleys with 13 teeth at the top and a massive 19 teeth at the bottom greatly minimize the movement of the chain links as they pass through the cage, thus significantly reducing friction and effort. In addition, the service life is significantly extended compared to other commercially available systems. The RS version marks the beginning of the future for the Danes. The contemporary new look of the bearing cage is more angular and thus adapts to the design trends of bicycles and groupsets. It is still made of high-quality carbon fibres, which have been reinforced with polyamide so that the forces can be better distributed and absorbed. In technical terms, the new design offers a measurable increase in stiffness and durability, which increases shifting precision and makes it easier to digest possible falls or minor collisions with stones or branches. The most striking and probably technically most interesting innovation, however, are the pulleys. The teeth, which sit 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, toothed profile, which ejects all dirt during movement and prevents dirt from penetrating the interior in the first place.In addition, the closed design prevents twigs or small sticks from getting caught in the pulleys and potentially causing damage to the cage. Ceramicspeeds own high-quality ceramic/stainless steel hybrid ball bearings continue to rotate in the center. These have to compensate for a great deal of friction, as they rotate 4 - 5 times faster than the crank, depending on the gear ratio, and therefore benefit in particular from a low-friction and durable bearing. The Ceramicspeed SpeedBalls are 15% harder than those of the competition and can absorb considerably more force. They also have an incredibly smooth surface, thereby reducing rolling resistance to a minimum. All these improvements have also increased the service life by a factor of 6. Ceramicspeed uses only the best materials and the latest technologies in production to ensure the highest possible quality. All products are handmade in Denmark. No hydraulic presses are used during assembly. Manual assembly eliminates manufacturing tolerances and guarantees a perfect fit every time. So that you really only install the best on your bike. Maintenance Ceramicspeed components are high-tech features for your bike. They offer you maximum performance, but also require regular maintenance and care. The oil included in the scope of delivery is used for maintenance and has been specially formulated for these bearings. Lubricants from other manufacturers are not recommended. Important notes When traveling, please remember to remove the complete rear derailleur with an Allen key, as very few bicycle transport bags offer sufficient space for the OSPW system. Ceramicspeed is confident in its products and offers a lifetime guarantee on this rear derailleur cage system. Technical data Roller material: Teeth: Composite | Disc: Aluminum Number of teeth top: 13 Number of teeth bottom: 19 Rear derailleur compatibility: Shimano Dura Ace Di2 9250 / Ultegra Di2 8150 Chain compatibility: 12-speed largest cassette sprocket: 34 teeth Cage color: black with white lettering Roller color: black Weight according to manufacturer: 101g Weight self-weighed: 102g