CeramicSpeed OSPW Derailleur Pulley System - ALPHA | for Shimano GRX, XTR, Deore XT (Di2, 12-speed) - Terre Edition

Thanks to its unique design and extremely low-friction bearings, the Oversized Pulley Wheel system (OSPW) manages to optimize the overall efficiency of the drivetrain. 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 tooth count.

The version for the electronic 12-speed rear derailleurs of the Shimano GRX, XTR, Deore XT and Deore series was specifically tailored to the demands of off-road riding. Accordingly, the cage design, which is inspired by the road bike-specific OSPW RS systems, aims to further increase functional strength. The combination of the innovative Alpha derailleur pulleys, here with 14/20 teeth, and the integrated ADR bearing protection system not only offers increased wear protection and better noise dampening but also prevents the ingress of contaminants and foreign objects. Last but not least, maximum protection and efficiency are achieved through the use of the handcrafted ceramic-hybrid bearings for which CeramicSpeed is known.

Technical details of the CeramicSpeed OSPW system

• derailleur pulleys: aluminum with composite teeth, Alpha Disc design
• bearings: hybrid (ceramic balls + stainless steel cups), handmade
• cage: carbon fiber reinforced polyamide (PA), injection molded
• tooth count: 14/20 (upper/lower pulley)
• weight: approx. 127 g (manufacturer's specification)

FURTHER DRIVE Technology = ALPHA Disc + Active Debris Remover (ADR)

The patent-pending ADR technology uses a new type of dust cover that is securely anchored in a groove in the derailleur pulley to completely enclose the bearing and protect it from dirt ingress. Meanwhile, the ALPHA concept relies on a disc-shaped derailleur pulley with a two-piece construction. The separate narrow/wide tooth profile is made of a special composite material to provide greater wear protection and reduce noise. The disc itself is made of solid aluminum, which not only increases rigidity and durability, but also prevents foreign bodies from getting stuck. What both technologies have in common is competition testing in off-road use, which successfully demonstrates their ability to effectively keep out mud and dirt even under the most adverse conditions.

Compatibility:

• shifting system: Shimano Di2 (electronic), 12-speed 
• rear derailleur (GRX): RD-RX827-SGS, RD-RX717-SGS
• rear derailleur (XTR): RD-M9250-GS/SGS, RD-M9260‑12
• rear Derailleur (Deore XT): RD-M8250-GS/SGS, RD-M8260‑12
• rear derailleur (Deore): RD-M6250-SGS
• cassette (gradation): min. 9-45 teeth / max. 10-51 teeth

Scope of supply:

rear derailleur cage incl. derailleur pulleys (pre-assembled)