The RD-RX820 is compatible with 11-34T and 11-36T 12-speed cassettes, providing a wide gear range so you can spin a comfortable cadence no matter the terrain type.
The SHIMANO GRX 12-speed rear derailleur also features an integrated chain stabilizer that delivers quieter shifting and more secure chain management during rough rides. And the chain tensioner has an ON/OFF switch for outings on smooth surfaces.
BENEFIT
Silent and secure rear shifting on rough terrain
FEATURE
Adjustable chain stabilizer prevents chain slap and drops
FEATURE
SHIMANO SHADOW RD+
BENEFIT
Smooth and reliable shifting on mixed surfaces
FEATURE
ON/OFF stabilizer switch matches terrain
BENEFIT
Maximum front chainring difference: 17T
BENEFIT
Top sprocket: Max. 11T/Min. 11T
BENEFIT
Low sprocket: Max. 36T/Min. 34T
BENEFIT
Total capacity: 42T
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Model No
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RD-RX820
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Series
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GRX
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Rear Speeds
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12
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Compatible Chain
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HG 12-speed
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RD Construction
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SHIMANO SHADOW RD+
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Mount
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Direct attachment, Direct mount
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Cable Adjuster
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✔
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Max. Front Difference
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17T
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Total Capacity
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42T
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Low Sprocket (Max/Min)
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36T / 34T
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Top Sprocket (Max/Min)
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11T / 11T
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Fluoric Coated Link Bushings
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4
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Pulley Bearings
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Guide & Tension pulleys
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Pulley Teeth
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11 / 13T
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Sunken Pulley Screw
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✔
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B-Axle
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Hollow axle
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Average Weight (g)
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270
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