CeramicSpeed OSPW RS Derailleur Pulley System - 5 Spoke | 3D Ti | for Shimano Dura Ace/Ultegra Di2 (R9250/R8150) - oil slick

OSPW RS – Shifting Time

With the introduction of the Oversized Pulley Wheel system (OSPW) in 2015, CeramicSpeed has set standards in modern cycling. And with the Racing Sport (RS) models, the Danish-based manufacturer of high-quality hybrid bearings is once again at the forefront when it comes to taking the next step towards the future. A visibly updated design, innovative technical functions and more customization options are intended to provide a premium riding experience with the OSPW RS system, which combines the efficiency-enhancing properties of its predecessor with even greater balance and sophistication.

Technical details of the CeramicSpeed OSPW RS system

• derailleur pulleys: titanium (3D-printed, hollow), 5-Spoke design
• bearings: hybrid (ceramic balls + stainless steel cups), hardened, coated, handmade
• cage: carbon fiber reinforced polyamide (PA), injection molded
• tooth count: 13/19 (upper/lower pulley)
• spring tension: adjustable (4 levels)

With its modern look characterized by clear edges, the OSPW RS derailleur pulley system from CeramicSpeed fits seamlessly into the contemporary design trends of current bicycles and groupsets. However, the revised construction not only looks good, but also increases strength and durability thanks to the reinforced cage – for achieving an even higher level of quality.

On a functional level, the handmade OSPW system, consisting of a cage and an upper and lower pulley, remains true to itself. The combination of sophisticated technology and extremely low-friction hybrid bearings makes it possible to noticeably improve the overall efficiency of the drivetrain. In addition, the spring tension, which can be adjusted in 4 stages, enables an individual setup tailored to the riding conditions.

3D-Printed Hollow Titanium

As the derailleur pulleys have the fastest rotating bearings on the entire bike, this upgrade is the most effective way to save energy and improve lap times. The combination of hollow titanium derailleur pulleys and coated CeramicSpeed hybrid bearings is not only incredibly light, but also extremely smooth-running. The innovative 3D printing technology not only reduces the system weight by up to 10 % compared to the standard configuration with aluminium derailleur pulleys, it also doubles the service life without sacrificing stable chain retention. The low weight also ensures lower rolling resistance, which reduces friction by 35 to 40 %.

To achieve the special finish of the Oil Slick version (optional), CeramicSpeed uses a coating of titanium aluminium nitride, which is applied using a PVD (Physical Vaporisation Deposition) process. Due to the special method of surface finishing, the coloring can vary from piece to piece, so that each derailleur pulley is unique.

Coated CeramicSpeed bearings

The secret of the unique coating formula is a metallic layer that increases the hardness of the underlying hardened stainless steel race by a further 75 %. The evenly applied layer, which is incredibly thin at 3 µm (0.003 mm), covers the entire surface of the bearing ring, both on the inside and outside. The result offers the ultimate gain in performance and durability. Combined with the incredibly smooth, friction-reduced ceramic balls, the result is a bearing that exhibits virtually no wear and is extremely resistant to corrosion.

Coated CeramicSpeed products are covered by a lifetime warranty. The detailed warranty conditions can be found at www.ceramicspeed.com.

Compatibility:

• shifting system: Shimano Di2 (electronic), 12-speed
• rear derailleur: Dura Ace RD-R9250 / Ultegra RD-R8150
• cassette (max. sprocket size): 36 teeth