Shimano acera m3000 shadow 9sp rear mechthe m3000 groupset is an innovation in 9 speed technology when 10 and 11 speed systems are dominating the market this 9 speed component benefits from the advancements achieved by the most modern of parts for many riders however 9 speed is more than enough gearing for most applications this derailleur has been designed with the shadow profile long cage keeping it tucked in behind the chainstay to help avoid strikes from any trail obstacles features ca