CeramicSpeed OSPW X for Shimano GRX 2x12 Wheel System

Thanks to its unique design and extremely low-friction bearings, the system (OSPW) manages to optimise the overall efficiency of the drivetrain. The same applies to the OSPW X models, which are specially designed for gravel and cross disciplines. Their successful use in CX World Cups and prestigious races such as Paris-Roubaix and Strade Bianche shows that they meet the corresponding requirements for durability, longevity and low friction to a particularly high degree.

The handmade OSPW systems consist of a cage as well as an upper and lower pulley, which are matched to the respective rear derailleur type by means of a corresponding number of teeth. In the version for Shimano GRX 2x12-speed rear derailleurs, the concept with oversize derailleur pulleys reduces friction by 35 to 40 % compared to the standard configuration. In addition, the adjustable spring tension enables an individual setup tailored to the riding conditions.

For even greater durability, both derailleur pulleys are equipped with ceramic hybrid bearings with coated stainless steel cups. Their entire running surfaces are coated with an extremely thin (2-3 micrometres) protective layer, which is 75 % harder than hardened steel. This not only reduces friction even further, but also makes the bearings less sensitive to dirt.

• Derailleur pulleys: aluminum
• Bearings: hybrid (ceramic balls + stainless steel cups), handmade
• Cage: carbon fiber reinforced polyamide (PA), injection moulded
• Tooth count: 13/19 (upper/lower pulley)
• Spring tension: adjustable (4 levels)
• Weight: approx. 70 g (manufacturer's specification)

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.

Compatibility:

• Shifting system: Shimano GRX, 2x12-speed
• Rear derailleur: RD-RX820 (mechanical) / RD-RX825 (Di2, electronic)
• Cassette (max. sprocket size): 36 teeth

• Product Name: CeramicSpeed OSPW X Derailleur Pulley System for Shimano GRX 
  
• Manufacturer: CeramicSpeed
  
• Item Code: CSP713469
  
• Activity: Cycling
  
• Material: Aluminium, Ceramic
  
• Usage bikesport: Cyclocross, Allroad / Gravel
  
• Shifting System (Manufacturer): Shimano
  
• Number of Gears - rear: 12
  
• Shifting Type: Chain - Mechanical, Chain - Electronic
  
• Rear derailleur accessories: Jockey Wheels, Cage Parts, Tuning Parts
  
• Model year: 2026
  
• Collection: Full year
  
• Color: Black
  
• Weight: 70g
  
• Weight Source: Manufacturer

Rear derailleur cage incl. derailleur pulleys and bearing oil (15 ml)