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Shimano's Ultegra RX RD-RX800 11s Rear Derailleur features a clutch design that eliminates chain drop on rough terrain and provides a better interface with a Shimano 1x set up.
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.
Reviews Ordered by Most Relevant First
5 stars
4 stars
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1 stars
So far, so great
by Dolan
Competitive Racer
PDX
5 of 5 customers found this review helpful.
So, it adds 40 grams over a standard Ultegra derailleur, but if you're looking at this, you know it's well worth it. After a number of CX races and gravel rides with it, the clutch noticeably works in the sense that you don't notice the chain slap you did before, and you don't notice your chain dropping. There's a little bit more friction, and shift effort is a tiny bit higher, but well worth it for the peace of mind this derailleur gives you.
Reviewed 11/2/2018
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One of my favorite upgrades
by ScottieMo
Daily Commuter
New England
5 of 5 customers found this review helpful.
Conclusion A clutched rear mech will probably become a standard for everyone but triathletes.
I bought this upgrade to replace a dying 6800 rear mech. I am a daily commuter, mixed surfacelong ride weekender. Shifting is crisp, but the real pleasure has been a lack of chain slack or slap. My chainline stays tight no matter where I'm riding. I ride over potholes, train tracks, dirt trails, fire roads and overall poorly maintained roads. The other nice part is that the cable is now tucked underneath everything rather than to the outside in the 6800 series, so it should take less abuse. Adjustments on the barrel adjuster are easier as well.
Reviewed 11/5/2018
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Fantastic for taking your bike offroad!
by Anonymous
Competitive Racer
Boston
3 of 3 customers found this review helpful.
This is such an amazing difference for a cyclocross/gravel bike. When I ride on the road I mostly leave the clutch flipped off (it makes the shifting a little stiffer), but when I get to a trail it's easy to flip on and almost entirely eliminates the chatter of your chain on the chainstay. I find that it helps keep the chain from jumping gears or falling off in very rough stuff as well. I don't notice the stiffer shifting action amid the bumps of riding offroad, so that's a non-issue for me. Mostly, it's soooo much quieter to ride down a trail. I love it!
Reviewed 1/21/2021
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Very smooth
1 of 2 customers found this review helpful.
Works as advertised. Im primarily a road cyclist but love that I can tighten up the chain for excursions on gravel and modest dirt tracks.
Reviewed 8/5/2019
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Great upgrade
Needed a replacement for my worn 105 derailleur and wanted a clutch. This fit the bill, shifts are crisp, no complaints.
Reviewed 7/1/2019
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