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CeramicSpeed

CeramicSpeed OSPW RS ALPHA derailleur cage for Shimano 9250/8150, black

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539 € - 569 €
RRP 609 €
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CeramicSpeed ​​OSPW RS ALPHA derailleur arm for Shimano 9250/8150

The OSPW system optimizes the overall efficiency of your drivetrain thanks to its unique design and extremely low-friction bearings.

Ceramicspeed's OSPW system is probably the best way to optimize performance. Large derailleur pulleys with 13 teeth on the top and 19 teeth on the bottom greatly minimize the movement of the chain links as they pass through the cage, greatly reducing friction and strain. In addition, the service life is significantly extended compared to other commercially available systems.

The derailleur pulleys are also made of aluminum. They represent the absolute top solution for all riders who want to get the most out of themselves and their equipment in the race, and for whom every saved watt is more important than anything else. Derailleur pulleys and especially their bearings have to compensate for high friction, so they benefit from a durable, low-friction bearing. Ceramicspeed SpeedBalls are 15% harder than the competition and can absorb significantly more force. They also have an incredibly smooth surface, reducing rolling resistance to a minimum.
Product features
13 and 19-tooth pulley significantly minimizes chain movement when passing through the cage
SpeedBalls bearings with smooth surfaces significantly reduce rolling resistance to almost
Product details
Groupset Other
Compatibility Dura Ace RD-9250 and Ultegra RD-8150
Material cage: carbon/polyamide, pulleys: composite/aluminium, bearings: ceramic/stainless steel
Pulleys upper: 13T, lower: 19T
Maximum cassette size 36T
Weight 100 g
product ID 321117
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marosink marosink • 6 January 2026 at 12:09
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Variant CeramicSpeed OSPW RS ALPHA ramienko prehadzovačky pre Shimano 9250/8150 Niro Special Edition, čierna

6 January 2026 at 12:09
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bl8ckb8ger bl8ckb8ger • 10 March 2025 at 16:54
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Variant CeramicSpeed OSPW RS ALPHA Team Edition ramienko prehadzovačky pre Shimano 9250/8150, čierna/biela

10 March 2025 at 16:54
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info_5t61 info_5t61 • 22 January 2026 at 19:17
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Variant CeramicSpeed OSPW RS ALPHA ramienko prehadzovačky pre Shimano 9250/8150, čierna

Hello, I have a road bike equipped with a Shimano Dura-Ace Di2 RD-R9250, 12-speed electronic set. I would like to make sure that this product is suitable for my set. I would also like to ask if when purchasing this CeramicSpeed ​​OSPW RS ALPHA derailleur hanger, the CeramicSpeed ​​UFO Factory Optimized KMC chain, 12-speed, 126 links must also be used, or can a classic chain, such as Shimano XTR, be used.
Thank you for the information.

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22 January 2026 at 19:17
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marosink marosink • 22 January 2026 at 23:35 •replyinfo_5t61
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SK ahoj, tento produkt je vhodny na tvoju sadu Dura-Ace Di2 RD-R9250 a moze ho pouzit s akoukolvek 12 rychlostnou retazou Shimano alebo KMC

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22 January 2026 at 23:35
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CeramicSpeed
Accessories CeramicSpeed
CeramicSpeed is a Danish brand that specializes in high-performance ceramic bearings and drive components for various industries including cycling, automotive and industrial applications. The brand is known for its innovative and cutting-edge technology, offering products that aim to improve the efficiency, durability, and overall performance of mechanical systems. CeramicSpeed was founded in 2004 by Jacob Csizmadia, a mechanical engineer with a passion for cycling. Frustrated by the limited options for high-quality bearings in the cycling industry, Csizmadia decided to develop a superior solution. He began experimenting with ceramic materials, which are known for their low friction and high wear resistance. After years of research and development, CeramicSpeed was born.
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