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.

Features

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

Specifications

Maximum Sprocket: 30T

Minimum Sprocket: 11T

Maximum Front Difference: 16T

Total Capacity: 35T

Weight: 204g

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