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In Stock & Ready To Ship — XT/Ultegra RT-MT800 Disc Rotors
Shimano Dura-Ace RD-R9100 Rear Derailleur Shimano Dura Ace RD-R9100 Rear Derailleur
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Shimano Dura-Ace RD-R9100 Rear Derailleur

Mfg PartNum:IRDR9100SS
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Backorder: This item is currently out of stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

Shimano's RD-R9100 Dura Ace Rear Derailleur uses a low-profile Shadow design that keeps it more closely tucked beneath the cassette for more stable shifting and reduced likelihood of being damaged in a crash. It also allows the upper pulley to maintain a consistent distance from the cogs across all gears for more precise shifting on wider-range cassettes.

Compatible with Shimano 11-speed road groups.


  • Low-Profile Shadow RD Design
  • Largest Cog Size: 30T
  • Minimum Cog Size: 11T
  • Maximum Chainring Difference: 16T
  • Total Capacity: 35T

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.

Mfg PartNum: IRDR9100SS 

Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Reviewed 1/28/2021
by Anonymous
Cycling Enthusiast
Grass Valley, CA
Value Rating
Overall Rating
2 of 2 customers found this review helpful.
The design improvements reflect Shimano's high regard to provide seamless shifting.

I use this on a Cannondale SuperSix High Mod that was originally equipped with a Dura Ace 9000 rear derailleur. While the DA 9000 shifting was excellent, it was a short-cage derailleur, and I wanted to switch to an 11-30 cassette. I am now 71 years of age and I still regularly climb gradients that can easily exceed 10%. The Dura Ace R9100 coupled with an Ultegra 11-30 cassette has not only made for quieter shifting, but it has made it just a little bit easier to climb the most challenging hills around my neighborhood. I also like the shadow design, and, even though I purchased B-Stock at a nice discount, there were no flaws in the derailleur whatsoever. I am very happy with this purchase.

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Reviewed 7/12/2021
by Olivier
Competitive Racer
San Francisco Bay Area
Value Rating
Overall Rating
Best of its class

Precise shifting. Light. Easy to install. Only issue I have had so far is that the pulley/jockey wheels are on the noisy side of things. Nothing alarming, but it seems to be taking more time to "break in" than Ultegra.

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Reviewed 11/12/2021
by Anonymous
Cycling Enthusiast
Richmond VA
Value Rating
Overall Rating
Excellent upgrade and weight savings for any mechanical drivetrain.

Replaced an Ultegra derailluer that was absolutely fine but the weight savings and reasonable price made me do it. Just a great upgrade in my opinion.

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Reviewed 4/26/2019
by Loren
Cycling Enthusiast
Seal Beach, Ca
Value Rating
Overall Rating
Superb function. Gorgeous to look at.

I'm an older, semi-fast recreational road rider with over 30 years experience with top of the line group sets. These include Campy, Shimano and even Suntour. I had a full Dura Ace 7900 group on my Litespeed Archon T1 and the shifting was dialed. In fact everything worked so damn well. But then I decided to do an upgrade to a Dura Ace 9100 mechanical group, mostly because I just dig the hell out of the way it looks. After I installed, adjusted and rode the new set up, I was just amazed that the front and rear shifting was far better than the 7900 group. Another thing that I'll have to wait to verify, but the drivetrain is silent. I haven't had much riding time on it, maybe 150 miles and haven't lubed the Dura Ace chain yet. It still has the packing grease. I'll see what it sounds like when I lube it.

The reason I only gave 4 stars for value is that I'm pretty sure Ultegra would function just as well, but at 12 the price. The glossy finish on the Dura Ace makes me swoon.

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Reviewed 9/1/2018
by Rageman
Cycling Enthusiast
Value Rating
Overall Rating
Excellent derailleur, excellent service

Replaced broken derailleur, my fault. New unit is exception. Clean sharp shifts and very smooth operation in every way. Simply the best. Shimano is proud of their product and price is always on the high side. Great deal with BTD and ordering and shipping is esy and swift. Plus points adds to the value.

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