The mechanical Shimano GRX RD-RX400 rear derailleur is characterized by quiet, smooth, precise and reliable shifting even in the most demanding terrain.

This is mainly due to the Shadow RD+ chain stabilisation system which prevents the chain from slapping and dropping as well as from unnecessary movements of the derailleur's cage, thus ensuring uninterrupted shifting performance. That is why an On/Off switch can be found next to the upper pulley, much like Shimano’s mountain bike derailleurs. When activated the rear derailleur pivot takes a firm hold to reduce excessive movement, noise and general "chain chatter". The 10-speed rear derailleur will accommodate cassettes with 11-32 teeth up to cassettes with 11-36 teeth.
Material: aluminium (painted), glass fiber reinforced polymer (GFRP), stainless steel, steel
Weight supplement: manufacturer's specs


Shifting System 10-speed
Shifting Acuation Mechanical
Smallest Sprocket 11
Rear Derailleur Cage Medium
Rear Derailleur Max. Teeth 36
Rear Derailleur Capacity 41
Max. Chainring Spread Teeth 16
Colour Black
Weight 303g

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