Product Condition The Ultegra RD-R8000 Rear Derailleur is in Excellent condition The Derailleur is in excellent condition The derailleur was previously owned for approximately three weeks The following observation has been made about this item The derailleur is clean The pulleys appear to have seen little use Item sold as is All warranties voidSize Unisex LongColor GrayRetail Cost 10399Shimano 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 harms way and allowing a better chain path off the top jockey wheel in relation to the cassette Shimanos R9100 group is the first time we saw this technology carried over to the road side and were happy to see its inclusion on the Ultegra RD-R8000 rear derailleurThe RD-8000 is the crowning jewel on the new Ultegra group and if you are building up or updating a bike you really cant 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 widths margin in a bunch sprintThe 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 its a perfect addition to a full Ultegra bike or those running Dura Ace who want to run a bigger cassetteAnother 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 shiftseven with the larger cassette ranges were beginning ride on everything from tarmac to gravel We are happy to see Shimano continuing with a barrel adjuster at the derailleur Road shifters dont have adjusters at the levers like mountain bike shifters do and not all of us are fans of in-line adjusters Shimanos 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 durabilitya trait all the more important now that were also abusing Ultegra on gravel and dirtUltegra RD-R8000 Rear Derailleur DWGAMZY