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Shimano Ultegra RD-R8000 Rear Derailleur

Shimano Ultegra RD-R8000 Rear Derailleur
Sale $74.99$99.99 25% Off

Item # SHI00G4

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  • Gray, Long ($74.99)
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Item # SHI00G4


Wider range, narrower gap.

Shimano has used Shadow technology for years on its mountain bike rear derailleurs. It allows for a lower profile and places the derailleur further inboard, keeping them out of harm's way and allowing a better chain path off the top jockey wheel in relation to the cassette. Shimano's R9100 group is the first time we saw this technology carried over to the road side, and we're happy to see its inclusion on the Ultegra RD-R8000 rear derailleur.

The RD-8000 is the crowning jewel on the new Ultegra group, and if you are building up or updating a bike, you really can't do wrong with this group. The additional range afforded by the longer cage opens up the Ultegra group to adventure bikes and brings the precision, durability, and value to the masses. Additionally, if you just want to add a wider range to your Dura-Ace steed, adding the long cage Ultegra derailleur and cassette is all you need to spin perfect circles up long mountain passes. The shifting is impeccable, the durability is immaculate and the performance gap to Dura-Ace is about a tire width's margin in a bunch sprint.

The change to an aluminum cage and some other minor hardware details are all that separate the Ultegra R8000 version from the Dura-Ace 9100 unit. Two cage lengths are available with cassette ranges from 11-30t (short) and 11-34t (long). Given a few design tweaks, the R8000 rear derailleur works best when paired with R8000 or R9100 levers, and it's a perfect addition to a full Ultegra bike or those running Dura Ace who want to run a bigger cassette.

Another advantage of the Shadow design is the more linear path of the derailleur when shifting, which allowed the engineers at Shimano to create a shifter with a shorter throw resulting in more precise and quicker shifts—even with the larger cassette ranges we're beginning ride on everything from tarmac to gravel. We are happy to see Shimano continuing with a barrel adjuster at the derailleur. Road shifters don't have adjusters at the levers like mountain bike shifters do, and not all of us are fans of in-line adjusters.

Shimano's wizardry in manipulating aluminum creates bodies, pivots, and cages that are strong and light. Precision bushings allow smooth movement and ensure proper indexing, and the alloy cage aids in stiffness, helping to improve the shifting response and adding durability—a trait all the more important now that we're also abusing Ultegra on gravel and dirt.

  • A road race derailleur that doesn't fear gravel
  • Shadow Technology improves shifts and protects in crashes
  • Durable construction equal to years of on- and off-road rides
  • Barrel adjuster makes tuning less fiddly
  • Long cage handles up to a 34t and short cage is good up to 30t
  • Also extends the cassette range of Dura-Ace 9100

Tech Specs

Cage Length:
short, long
[short] 35t, [long] 39t
Cassette Range:
[short] 11-30 t, [long] 11-34 t
Shimano Ultegra R8000, Shimano Dura-Ace R9100
Claimed Weight:
[short] 200g, [long] 210g
Recommended Use:
cyclocross, gravel, road
Manufacturer Warranty:
2 years

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Crisp and Precise

  • Familiarity: I've used it several times

Recently upgraded one of my bikes from Shimano 6800 to the new R8000 group and couldn't be any happier! The upgrades to the cranks, derailleurs, brakes and shifters have made this one worthwhile upgrade.
I have been amazed at the crispness of the shifting performance with the new derailleurs and shifters, and it reminds me of the smoothness of the "older" Dura Ace 7800, but much more refined in how quickly is shifts.
If you have questions, please feel free to reach out to me.

Avg. ride time: 12h 5m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Will the R8000 RD work with 6800 STI shifters?

Yes. I just set it up on a bike. Front derailleur works too. MUCH easier to set up new FD.