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ShimanoUltegra RD-R8000 Rear Derailleur

$96.99 - $103.99

Item # SHI00G4

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Item # SHI00G4

Ultegra RD-R8000 Rear Derailleur

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 Lengthshort, long
Capacity[short] 35t, [long] 39t
Cassette Range[short] 11-30 t, [long] 11-34 t
CompatibilityShimano Ultegra R8000, Shimano Dura-Ace R9100
Recommended Usecyclocross, gravel, road
Manufacturer Warranty2 years

Actual Weight

Gray, Long
Gray, Short

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[short] 7.1oz (200g), [long] 7.4oz
200g), [long] 7.4oz (210g

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

What do you think about this product?



Ultegra RD-R8000 Rear Derailleur


Can I use this derailleur on a 9 speed? I have an older Giant Carbon TCR C2 and I want to upgrade the cassette but current dura acce short cage D only goes to 27 t. I want to have an 11-34 t cassette. Any advice appreciated, Thanks, Stephen

>Rating: 5

Great Derailleur for CX

I've used it several times

I picked up a longer cage one for CX to accommodate a greater number of teeth and thus far have been happy. I've raced it in both dry and super muddy conditions and it works well. I'm a big fan of Shimano components.


Will this work with 105 ST-R7000 STI Shifters?

>Rating: 5

Fast shipping

I returned this product before using it

I was impressed with how fast this shipped and the price. Unfortunately I ordered this 11-speed derailleur when I needed a 10-speed. Top notch Ultegra quality regardless. Returning the order was a breeze. I will be shopping with Competitive Cyclist again

Could you tell me what 10 speed derailleur you got? I am having a hard time seeing the distinction between 10 sp and 11sp on the product details. Thanks.

>Rating: 5

Big difference between 105 5800

I was changing wheels and wanted to go to a wider cassette for long climbs in my previous short cage 105 5800 I was happy with. I wanted to go up to an 11-32 cassette and so I went with the Ultegra long cage and it shifts fast and crisp as I could ask for and was easy to install. as far as performance it is defiantly worth the price difference to me and it handles the 11-32 cassette well and at some point ill probably try it with an 11-34. as far as during the install in the box you will get a new cable housing end and there are directions on how to route the cable as it was different than the previous 105 RD. the new cable path was defiantly shorter as I tried of a good bit of cable. adjustments are pretty straight forward to getting it tuned up and running like it should.

Hi Zach, thanks for the great review!

>Rating: 4

Classic improved

Great for long miles, and have the added benefit of the shadow tech from the mountain ders. Solid construction.

>Rating: 5

Shimano R8000 rear derailleur

I've used it several times

This derailleur is so much better than the previous design. I love the flexible housing that it comes with so that it works better with all types of frames. Setup is very easy and shifting is smooth.


Sorry - But I have never changed my own derailleur and I want to confirm - I have a Litespeed T5G Thru axle with Shimano RD6800 ss(Short Cage) and have been looking to upgrade to a long cage - - Sounds to me this RD-R8000 Long will work from the conversation here. I just want to confirm - plus maybe you can also suggest correct cassette and chain combo to go with it. Thank You

Hey ET - Yeah that derailleur will work and will be compatible with an 11-34 cassette if you are looking to get more range. Nate

>Rating: 5

Significant step up from the 6800

I've put it through the wringer

Purchased this to replace my Ultegra 6800 short/med (honestly, not sure which it was) cage to ensure compatibility with an Ultegra 11/32 cassettte. All I know is that according to Shimano, the R8000 Long Cage is required with a 50/34 up front and 11/32 in the rear. PROS: o So smooth that shifts are often completely transparent, i.e., "did I actually just switch gears?" o The B adjustment screw actually does something. CONS (not really CONS, just notes of caution): o The B adjustment screw actually does something. ;-) This adjustment now definitely affects indexing and you need to pay attention to getting it right. See any number of YouTube vids on the subject. o As I suspect is the case with any long cage derailleur, hanger alignment is critical. My short cage shifted just fine with what turned out to be a pretty badly bent hanger. The R8000 would have none of that, and simply refused to shift well even after hours of performing all the standard adjustments. If you can normally adjust a rear derailleur in 15 minutes, and your new R8000 has taken 3 hours with no luv, your hanger is bent. You can probably get it very close with a tape measure and spare wheel screwed into the hanger, but the Park tool or the HAG from Abbey are the official tools of choice, or your LBS. o The geometry of the cable pull is completely new/different. You might need to adjust the length of the chain stay cable housing (I had to shorten mine). Also, the R8000 is pretty intolerant of excess cable dangling past the lock screw. The excess needs to be trimmed pretty short (~30mm) and/or bent to ensure it doesn't interfere with the derailleur or spokes. I left mine long while performing inital adjustments and it got caught in the spokes about a dozen times before I temporariy zip tied it off in an un-offending position. In short, as is typical with Shimano, their high end tech is trickling down to the mid and lower ranges and defintely does not disappoint.

Stephen, Appreciate the incredibly detailed review and I'm sure others will as well. I too found the new R8000 to perform exceptionally and the design upgrade didn't hurt either!

Thanks, that's very helpful.

Thanks for the detailed review and things to be mindful of. Looking to replace my 6800 RD with this one in the long cage model to run 11x32 cassette.

>Rating: 5

Widest of Ranges

I've used it several times

I purchased this derailleur to get wider/easier gearing for my wife's bike than her current Ultegra 6800 with 11-32 gearing (we live in a very hilly area, she is new, and she does not have an affinity for suffering) Anyway. Based on a write-up I decided to pair this with the SRAM 11-36 cassette and what do you know, it works! Now Shimano would say you shouldn't do it, and if you prize super smoothe shifting over broad gearing then don't do it. However, if you don't mind sacrificing the shifting smoothness (it really isn't bad and only affects coming down the cassette due to the B tension needed for the upper pulley to clear the largest cog), then this is an amazing solution. My wife was super stoked on this setup.

>Rating: 5


I've put it through the wringer

Purchased the Ultegra RD-R8000 short cage as part of an upgrade to full Ultegra, and this rear derailleur is nothing short of awesome. Easy to set up, low profile design, and it's so smooth I often don't feel my shifts through the bike, only in the change in resistance at the crank. Also, this derailleur seems to require much less input from the shifter, which took some getting used to, but I love it. The RD-R8000 Short Cage weighed 197 grams on my PT scale.

>Rating: 5


I've put it through the wringer

Not much to say here... As good of a mechanical shifting action as you are going to get. Shifts under load and when caked with frozen mud. Shifts a 36T cassette with no issues.


I’m running a compact front with a 34 in the back. I would love to run a 36 on my gravel/skinny tired mountain bike..... and was curious about this..... any other mods?

>Rating: 5


I absolutely am impressed with the new groupset. Shifting under load or going over rough terrain it shifts seamlessly. Rode this weekend cassette and rear derailleur were packed with snow and it did not affect my shifting at all I was absolutely amazed.

>Rating: 5

Gear for Gravel

I've used it once or twice and have initial impressions

I got the long-cage version of this new deraillure because I wanted to run a 40-tooth MTB cassette on my 'cross bike for a gravel race in the mountains. It replaces an Ultegra 6800 long-cage RD. I wasn't sure this new combo would work, since the 40t cassette and my 46t chainring exceed the published capacity of this deraillure. After a 3-hour gravel ride yesterday with lots of steep hills, I can confirm this combo works flawlessly when paired with 46/34t Ultegra chain rings, a 6800 front deraillure, Ultegra 11-speed chain and Ultegra 6800 hydro STI levers. I put the chain in all the worst situations, like shifting from big/big to little/big and then downshifted while going uphill, and it never missed a beat. The first adjustment I made in mounting the RD was to slam the B screw all the way down. That move provides good clearance between the top jockey wheel and the 40t sprocket. Initially I had some shifting problems, but I put in a new cable and shortened the housing, which fixed the problems. My Lynskey Cooper CX has full cable housing. This new RD does not move vertically like my old 6800, and you need very little slack in the housing where it approaches the mech. Once I shortened the housing and remounted it with the new cable, everything worked perfectly. The RD-R8000 is a significant improvement over the 6800, which is a really good RD. The new one keeps better tension on the chain, especially on rough gravel, which results in better shifting. I have not yet tried it with the 28-12t cassette on my road wheels. I suspect I will have to back out the B screw and put on a shorter chain. This RD performs so well with the MTB cassette, I may just leave the 40t on my gravel wheels all the time. Props to CC customer support for a little advice on tuning this new RD. It mounts and tunes a little differently from the old one.

Thanks for this excellent and detailed review for us gravel riders.

>Rating: 5

Crisp and Precise

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.


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.

Yes, absolutely. I have that combo, and it's flawless.