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GRX RD-RX810 Rear Derailleur
Following the trends in the bike industry, its not all that surprising that groupsets are taking to the gravel, and we appreciate the careful attention and time that Shimano took in designing the GRX RD-RX810 Rear Derailleur for powering through variable conditions on a drop-bar bike. If you've been following Shimano in the all-road and off-road scene, the derailleur won't look shocking to you. In fact, it's nearly identical to the RX version of the Ultegra derailleur that was launched just last year, which took queues from the Shadow mountain bike derailleur, adding in a clutch mechanism to reduce chain slap and dropped chains for a quieter and more secure ride both on and off-road. When in the on position, the clutch increases the spring force to provide crisp shifting and zero chain slap and is easily flipped off for wheel changes. What we find to be big news is that Shimano crafts the GRX RD-RX810 for both 1x and 2x setups, stepping outside of the 2x only comfort zone that the brand had held to, with this short-cage model being optimized for an 11 - 34t cassette.
Following in the footsteps of the revamped Dura-Ace and Ultegra groups, this GRX derailleur gets its Shadow cage treatment placing it closer to the frame and under the cassette keeping it out of harm's way and less likely to take the brunt of a driveside crash. This also allows the derailleur to move in a much more linear path allowing for shorter throws with less effort. The RX810 model comes in one cage length, short, which accommodates an 11-34t cassette allowing for a wide range gear ratio when paired with a double without the usual huge jumps between the cogs like on a 1x setup.
Sticking to what the brand's customers know well, Shimano continues to use the Dura-Ace, Ultegra, and Tiagra designation with the GRX line, with this particular model falling under the Ultegra umbrella, which means it gets the usual materials and finishes that we expect from a groupset that's just one step from the top. Its weight, smoothness, and durability make it more than capable of racing against the competition on course, or the sun to your campsite for the night on a bikepacking trip.
- A designated gravel derailleur built to handle the knocks and chatter
- Shadow clutch mechanism increases spring tension to eliminate chain slap
- Clutch is easily flipped to make wheel changes and flat fixes a breeze
- Derailleur cage tucks closer to frame to avoid hits and bumps
- Compatibility for both 1x and 2x drivetrains
- Durable alloy construction handles mud and off-road adventures
- Works with current Shimano 11-speed road shifter/brake levers
- Low-profile Shadow design helps avoid damage from impacts
- Short cage accommodates up to a 34t sprocket, look to the 812 series for larger cassette needs
- Item #SHIU19D
- Cage Length
- Cassette Range
- [maximum] 11-34t, [minimum] 11-30t
- 1x11, 2x11
- existing 11-speed mechanical Dual Control levers, Shimano GRX levers
- Claimed Weight
- 8.9oz (251g)
- Recommended Use
- Manufacturer Warranty
- 2 years
What do you think about this product?
January 30, 2020
- I've used it once or twice and have initial impressions
I set out to rebuild my wife's bike and this derailleur was highly recommended by a friend. Shifts are smooth and precise and the quality is what one would expect from Shimano. You can't go wrong.
August 15, 2019
- I've put it through the wringer
Bolted on directly in place of an r8000 105 on my Cannondale Topstone. Much quieter on rough roads! My only small gripe is a slight increase in shift effort when the clutch is turned on. Would not hesitate to buy again!