Shimano Ultegra RD-R8000 Rear Derailleur
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Shimano Ultegra RD-R8000 Rear Derailleur
Code: RD-R8000
Shimano Ultegra RD-R8000 Rear Derailleur - 11 Speed

The Ultegra R8000 Shadow design rear derailleur features wide link design to aid drivetrain efficiency and ensure quick, accurate shifts.



  • Sleek integrated appearance
  • New low-profile design
  • Race endurance
  • Optimized slant angle
  • Wide compatibility
  • RD-SS covers: 11-25T to 11-30T
  • RD-GS covers: 11-28T to 11-34T
  • Cable not supplied
F. ChrétienFast delivery in Canada, nothing is missing and in good condition. Will have to try my new parts soon. Thanks ! :)
Mr ReyesSmooth shifting and easy to install
Mr NGUYENUpgraded from 105 to Ultegra for the smoother shifting! It is smooth!
Tom BlackFinally joining the 21st Century and upgrading from 1990's Dura Ace 8 Speed to this .... the frame is still a vintage 1988 steel Ellis Briggs 653 ... nothing at all wrong with the original Dura Ace and it's going on the training bike.
Mr PASIONExcellent product at a fair price. Shifts smoothly.
Chriseasy set up, runs beautifully smooth. the shimano OT RS900 casing not required, the journey to the derailleur from my frame is short with barely any flex. good to see tiny screw heads for top / low end adjustments replaced with 2mm hex
WayneExcellent product. Barrel adjuster difficult to use and not nearly as good as the barrel adjuster on the RD-R6800. Information sheet rather poor and somewhat misleading.
Darth BikerI purchased this Ultegra rear derailleur to replace an older 105 mech on my new bike build that just wasn't working out. Turns out to have been a great upgrade, shifting performance is spot on and everything you'd expect at this level. It doesn't hurt at all that it also looks right great!
Mr AnderssonJust what I needed it for my bike, smoth, great design and works perfect, shipping was awesome, pretty fast, I'll keep shopping at MERLiN CYCLES =)
Mr SmithAs always top quality Shimano product, excellent shift quality with easy setup. Merlin continue to offer an excellent service, please don't do anything different!
Steve S.Excellent product at a fair price. Shifts beautifully with my 11-34T cassette.
PaulMuch crisper shifting than my old 6800 rear mech (though some of that was due to age), good looks.
AlanCThis is probably the most effective and lowest cost upgrade you could do. I replaced an excellent R7000 with this and the improvement is noticeable. Lat time I had shifting as smooth as this was with Di2
Rob StoneLight shifting over my old 6800 Ultegra RD. Easy to install and easy to index thanks to the new H and L limit screws. Fast delivery from Merlin Cycles as normal and great price.
BarrieQuick precise shifting from Shimano's second level groupset, as good as Dura Ace but leaves a lot more money where you need it in your pocket lol
Mr mcleodReplaced an older 105. Hard to say if it shifts any better but looks great and slimmer profile means less likely to be damaged if bike dropped on drive side.
MattGood product. Bought to replace an earlier model that had been damaged. Easy to fit and set up. Good quick delivery from Merlin Cycles
Marc PickGood solid, very high quality mech, with the capacity to run wider range cassettes. Easy to set up, never misses a change... The spring is heavier duty than my prev Ultegra (6800 - I think) which is not a criticism, just an observation, so the shift feels more positive at the shifter, but the effort to change is higher.... Personally I prefer the 'feel' of the older generation Ultegra, but on a gravel or touring bike which will go over rough surfaces, I'm sure this heavier spring would be advantageous & control the chain tension better than before.
Mr HalesReally impressed with the new R8000 good smooth responsive gear change and looks good too.
Mr thompsonClass product, makes gearing so much smoother
DawnGreat product with a great performance in shifting.
Mr gordon-smithVery high quality, replaced tiagra... massive difference
L GordonShifts tightly, and shifts tidily even if I'm hamfisting the levers. Return spring is nice and strong so it shifts to smaller cogs really well, even if the cable starts to get a little stuck in the outers when releasing tension from the shifters.
Mr LEExcellent derailleur, very smooth ready for all hills with my 11-34 cassette
Mr HatcherGreat for giving you the extra big gears for those big climbs. Paired it with a 11-34 cassette with no problem.
MarkVery smooth and accurate. Got the medium cage and 11 - 32 cassette. Great to have this range of gears.
Mr NeuenfeldtWorks the way I have come to expect with Ultegra. Tucked in much tighter to the bike compared to the 5800. Nice to be able to use a 36t cassette.
CihatSmooth and fast gearing with good price fast dispatching from MC.
SimonBought to accommodate 32-11 cassette. Was concerned about compatibility with 6800 levers but all ok. Be warned mine came in OEM package so missing replacement cable sheath but not a problem for me. Cable fixings are different locations to 6800 version , I needed to replace cables as too short for this cage. Also be careful to mount correctly- read Shimano instructions else it will be on but rear wheel removal becomes impossible- many on internet seem to be complaining about this. If in ok then no probs!!!Fast delivery and competitive pricing separate Merlin from the rest
Vitali EvdochimSimple but efficient packing. Shimano product, almost plug and play. Looks great, works smooth.
Justin ErvinUpgraded to this from Tiagra, needless to say significantly better shifting and weight savings a plus.
Mr BROWNPair this with an 11x34 cassette to climb walls and then sprint down the descents. Looks even better than the 6800 and is technically improved maybe with the exception of the barrel adjuster.
JordanCan't beat Ultegra's price and reliability for its shifting performance
JOHNThis rear mech is the latest shadow derailer. I have one already on my winter bike and was so happy with its performance I wanted one for my best bike. It shifts perfectly.
Mr AmiBest shifting derailleur Shimano has ever designed and I own both the electric and mechanical version. By moving the derailleur under the chain stay the chain stays on the pulley longer giving a positive, smooth shift.
RVHSo far so good. I'm using it with 2 cassettes. 11-25 and 11-34, and though the 11-25 is technically below the minimum recommended range for this RD, it shifts just fine even with the b screw adjusted in for the 11-34. You do have to be very careful with chain length with the 11-34 so you can't go braindead and mistakenly shift to 50:34 and bend something. It does (barely) cover the entire 39 tooth range as advertised.
gregoryIncredibly smooth shifting. Much improved from the Shimano 105 that came on the bike. Thanks Merlin
Alastair StedmanAmazing rear mech. Smooth shifting. No need for for Di2 when mechanical is this smooth. Shifting action is very light. 10/10 would recommend.
Mr ArslanTakes really really less time to adjust from others before it. Shifting is easy. Don`t forget to add grease to cable entering point. (I adore it just for not using philips screw, this allen head makes everything easier)
AndrewTypical quality item from Shimano. Mid cage on my 2x cross bike, shifts nicely.
Mr CondonExcellent shifting. So smooth and crisp
AndrewSuper-sharp shifting and looks amazing on the bike too. I like the new 'shadow' angular, low-profile design which should help reduce damage to the derailleur in a crash. Feels like a big step-up from the already excellent 6800 Ultegra, and for most people Ultegra R8000 is the best Shimano option for both racing and training. Essentially the same performance as Dura-Ace for a lot less money and only a small weight penalty.
Duane CominsLooks the part and functions well. Once set up the gear changes are crisp and clean.
Mr DominguezWanted an Ultegra 11 speed rear mech and was deciding between this and the older 6800 version. Went for this one as it has the new shadow design which I thought was good. Fitted it easily to my new bike and it looks great. The cable holder is in a slightly different place to the older non-shadow style mechs so I had to shorten the outer cable but that wasn't an issue. The only negative is the barrel adjuster which I don't find works particularly well. I am tempted to swap it out for the older style one on one of my old mechs.
EymardEasy set-up and replaced my 105-5800 with this. Shift is light and looks good on my bike as well
Mr LeverSwapped this derailleur from the previous RD6800 model. There is a notable change in shift quality compared to the older model, more noteable on the downshift where the lag between lever click and gear shift is reduced. Shame its slightly heavier than the mech it replaces. Good value , makes the 105 range look at little pointless now.
Mr WehrmanSilent, light and stylish this is my favorite Ultegra build by far.
SmashLooks great, certainly changes much smoother than my 105 5800
CharlesBig upgrade from 6800, very fast and precise on my CX bike
Mr BARROSI am very satisfied with this Shimano Ultegra RD-R8000 Rear Derailleur. Very light, precise in the exchanges. Perfect!
DarrenLooks stunning and like the shadow set up. Great that they have combined the short cage and 30t cassette to give a great climbing set up that doesn't look like you are running granny gears.
GFGraeffWorks perfect with my Shimano Ultegra 6800 groupset. Shifting is way better and more stable than ever. I believe its because the shadow type design and the new guide pulley design. Great product from Shimano as always.
RobertDerailleur works as advertised. Have it paired with RS 700 shimano road trigger shifter and it is smooth and fast shifting.