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Shimano Ultegra Di2 RD-RX805 Rear Derailleur


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  • Gray, Long

Why We Like the Ultegra RD-RX805 Rear Derailleur

The Ultegra Di2 RD-RX805 Rear Derailleur is meant to take on all the rigors of rough road and gravel riding. Its clutch system improves shifting and reduces noise from chain slap, and there's compatibility with both 1x and 2x drivetrains and Shimano Di2 shifters. Experience smooth Di2 electronic shifting, a quiet ride and a good time.
  • Ultegra Di2 rear derailleur designed for rough roads and gravel
  • Clutch system improves shifting and silences chain slap
  • Compatibility with both 1x and 2x drivetrains and Shimano Di2 shifters
  • Durable alloy construction will give you years of on- or off-road use
  • Long cage handles up to a 34t sprocket
  • Di2 electronic shifting is precise and can be customized
  • Low-profile Shadow design helps avoid damage from impacts
  • Item #SHI00KT

Cage Length
[long] 39t
Cassette Range
[long] 11-28t through 11-34t
Shimano Ultegra R8050 and 6870 Di2, Shimano Dura-Ace R9150 and 9070 Di2
Claimed Weight
Recommended Use
Manufacturer Warranty
2 years

Tech Specs

What do you think about this product?


>Rating: 5

Extra gear range & added security

I've put it through the wringer

Made some upgrades to my gravel/CX bike this spring, including the addition of this RX derailleur. Coming from the 1x world, I knew how much I wanted to avoid chainslap when riding on rough surfaces but I wanted additional gear range while being able to run 2x set-up with 50/34 chainrings. This derailleur easily clears an 11-34 cassette and I'm sure folks have found ways to expand that even further. The on/off clutch system is pretty nice, really helps keep the chain under control. The only time I ever turn the clutch off is just to take my wheel off. If I do another Di2 build, I'm definitely getting this derailleur again.