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Shimano Dura-Ace Di2 RD-R9150 Rear Derailleur
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Shimano Dura-Ace Di2 RD-R9150 Rear Derailleur

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Mfg PartNum: IRDR9150SS
rating(4 customer reviews)
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MSRP: $696.99
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Rearing to go.

Shimano's RD-R9150 Dura-Ace Di2 11-speed Rear Derailleur incorporates the Shadow design that made its debut on their mountain bike drivetrains. This low-profile construction better tucks the derailleur body beneath the cassette for more stable shifts, quicker wheel changes, and less exposure to possible damage in a crash. It also keeps a consistent distance between the upper pulley and the cogs across the entire gear range for more precise and reliable shifts on wide range cassettes. Compatibility with Shimano Synchro Shift allows both the front and rear derailleur to be controlled by a single shifter up front.

Compatible with Shimano Di2 electronic groupsets only. Claimed weight is 204 g.


  • Low-Profile Shadow RD Design
  • Largest Cog Size: 30T
  • Minimum Cog Size: 11T
  • Maximum Chainring Difference: 16T
  • Total Capacity: 33T
  • 11 speed

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

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Mfg PartNum: IRDR9150SS 


Actuation: Electronic 


Discipline: Road 


Mount Type: Standard Rear Hanger 


Speed: 11 

Mfg Warranty: 36 Mo. Parts & Labor

Warranty URL: https://bike.shimano.com/en-EU/information/warranty.html


Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Little quieter on the shifting & like the new color .
by Anonymous
Cycling Enthusiast
4 of 8 customers found this review helpful.

Matches the color of today's matte black finish bikes . Seems to shift a bit quieter when shifting to different gears compared to the old . The only problem I had is that you have to make sure the derailleur is in a slight angle back when mounting on the hanger or else you won't able to take the rear wheel off the bike .

Reviewed 6/27/2017
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Proven, customizable, and dependable.
by Anonymous
Cycling Enthusiast
1 of 1 customers found this review helpful.

Used for Specialized S-Works Venge with Full Di2 Groupset.

Reviewed 10/7/2022
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What else would you expect?
by Jason A
Competitive Racer
1 of 1 customers found this review helpful.

It's Dura Ace. You know it shifts better than anything else, so you might as well get it.

Reviewed 5/28/2021
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Shimano Durace Di2 Rear Derailleur
by Tim Petrick
Cycling Enthusiast
Burien, WA
2 of 2 customers found this review helpful.

I had to replace my wife's rear derailleur after partially running over her bike with our car after a bike ride. She had an earlier model of the Di2 rear derailleur, but this newer version worked perfectly. It is super easy to install, looks great and shifts beautifully. True plug and play replacement.

Reviewed 10/8/2021
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