Shimano Alivio M4000 9 Speed Rear Derailleur
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- Trustpilot review 9.4 out of 51.417 reviews
The Shimano Alivio M4000 SGS can handle an aggressive style of mountain biking. The SHADOW RD has a proven technology that's reliable and durable. The Shadow has a design that ensures its derailleur is 15 mm less protruding, which reduces the risk of damage during cycling.