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Ceramicspeed OSPW-Shimano Dura-Ace Di2 R9150 Rear Derailleur

Ceramicspeed OSPW-Shimano Dura-Ace Di2 R9150 Rear DerailleurCeramicspeed OSPW-Shimano Dura-Ace Di2 R9150 Rear Derailleur
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From US$814.99
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In Stock Was: US$907.26
In Stock Was: US$907.26
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About Ceramicspeed OSPW-Shimano Dura-Ace Di2 R9150 Rear Derailleur

This product is upgraded in-house by a certified Bikebug technician and comes pre-installed with the below CeramicSpeed component:

1x Shimano Dura-Ace Di2 R9150 Rear Derailleur

1x CeramicSpeed OSPW System For Shimano

CeramicSpeed Oversized Pulley Wheel System (OSPW System) has been developed to answer the riders’ increasing need for improved drivetrain performance. The OSPW System optimises the overall efficiency of your drivetrain thanks to the extremely low friction of the CeramicSpeed Bearings and the unique design of the overall system.

Ceramicspeed OSPW-Shimano Dura-Ace Di2 R9150 Rear Derailleur

Nowhere is full Shimano Synchronized Shift more beneficial than in time trials and triathlons.

Reducing the number of buttons simplifies decision making stress for riders and allows lever dimensions to be slimmed down by 28% (from 40mm wide to 29mm) and lever weight to be reduced by 22% (from 128g to 100g). Satellite shifters also incorporate this new one button feature.

Rear derailleurs incorporate these new cockpit functions. Both electronic derailleurs are compact and designed to protect the shifting operation in the event of a crash. The low profile of the rear derailleur also comes with Shimano Shadow RD technology, positioning the derailleur further below the functioning sprocket. The Dura-Ace Di2 R9150 Rear Derailleur takes the Shadow technology from its mountain bike range and introduces it to the road.


Shadow Design -  places the rear derailleur under the chainstay and cassette to give a slimmer profile, which not only helps with aerodynamics but also offers extra protection in crashes. The Shadow design offers faster wheel changes thanks to the fact that it moves the derailleur out of the way of the dropouts. It also offers faster and more precise shifting than ever before.

One Cage Size - The new derailleur comes in only one cage size that will work with cassette sprockets up to 30T. This means that Dura Ace offers a greater rider tuned ratio than previous models.

Synchro-Shift - This technology allows you to shift to higher or lower gears with your right hand shifter and both front and rear derailleurs will operate to optimise chainline. It will also automatically shift the rear mech when you change from the large ring to the inner ring to maintain smoothness.

Ergonomic shifting operation without stress

Low profile rear derailleur design

Race endurance for less damage in crash

Maintains compact and smooth appearance


Maximum Sprocket: 30T

Minimum Sprocket: 11T

Maximum Front Difference: 16T

Total Capacity: 35T

Weight: 204g


CeramicSpeed OSPW System For Shimano

This OSPW System features a set of 17-tooth aluminium Pulley Wheels, available in red, black, or limited edition colours and in a specially designed polyamide (PA) and carbon cage.

Compatibility covers Shimano Ultegra (6700/6770/6800/6870) and Dura Ace (7900/7970/9000/9070) 10s and 11s, electronic and mechanical group sets. The OSPW System for Shimano fits up to 28t on most bikes. A special OSPW System has been designed for the Shimano 9100 and 8000 series (it's NOT compatible with the R8000 GS), featuring a 13/19-tooth combination and accommodating cassettes of up to 32t.

Developed and designed entirely by CeramicSpeed, the Oversized Pulley Wheel System for Shimano is advanced for the optimization of bike performance.

Everything from bearings to the cage is made from the highest quality materials. The oversized aluminium pulley wheels are fitted with standard or coated CeramicSpeed Bearings, which reduce friction to the minimum. The overall power savings of the OSPW System for Shimano reach 30%-60% or more in some cases. The OSPW System has a lifetime that lasts 3-5 times longer than the commonly used standard pulleys on the market. The OSPW System for Shimano comes as two different systems, one compatible with Ultegra (6700/6770/6800/6870) and Dura Ace (7900/7970/9000/9070), 10s and 11s, electric and mechanical groupsets, and another compatible with the Shimano 9100/9150 and 8000 series - EXCEPT the R8000 GS. While the first option features a set of two 17-tooth pulleys, the OSPW System for Shimano 9100/9150 and 8000 features an optimal 13/19-tooth combination specially developed to fit the design of the derailleur. 


17-tooth aluminium pulley wheels mounted with high quality CeramicSpeed bearings, in standard or coated version.

Cage is made from carbon fibre and reinforced PA.

OSPW System - developed, produced and assembled by hand in Denmark. It optimises your drivetrain and delivers access to the industry leading efficiency with watt savings that start at 2.4 watts.

High quality cage material and CeramicSpeed bearings inside the pulleys offer an extreme longevity, which is 3-5 longer than other commonly used pulley wheels on the market.


Rear derailleur: Shimano

Speed: 10-11

Compatibility: Shimano Ultegra/Dura Ace (6800/7800/7900/7970/9000/9070) 

Material: Aluminium PA/Carbon

Weight: 57g

More About The Manufacturer CeramicSpeed

CeramicSpeed is one of the world’s leading suppliers of ceramic bearings. As the first ones to introduce ceramic bearings to the cycling industry, CeramicSpeed has grown rapidly, focusing on cycling and industrial applications. They have more than 15 years experience in bearings applications, and have developed close relationships with their component suppliers over the years – each of whom is the very best in their field.


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