Amazon.com : SHIMANO ALIVIO RD-M4000 Rear Derailleur 9 Speed Long Cage Triple MTB Bike : Sports & Outdoors

Acera M3000

Acera M3000 is the first of Shimano's groups to offer a double crankset

Acera M3000 is the first of Shimano’s groups to offer a double crankset.
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Acera follows next. This group starts to introduce corrosion-resistant materials such as stainless steel on certain components.

It’s a 9-speed group that can be used with a 40/30/22 triple crankset or a 36/22 double crankset. It offers a wider range 11-36 cassette.

Additional groupset features

Besides offering extra gears, it’s common for the more expensive groups to offer additional features.

Clutch-equipped rear derailleurs, such as Shadow Plus from Shimano or Type-2 from SRAM are an example of a technology that is offered on these company’s groupsets, from Deore and SX Eagle upwards.

The clutch keeps the chain taut, which improves shifting over rough terrain, keeping the drivetrain quieter, and reduces the likelihood of dropping a chain.

Both Shimano and SRAM offer clutch-style rear derailleurs, these greatly reduce chain-slap noise and the risk of dropped chains through rough terrain

Both Shimano and SRAM offer clutch-style rear derailleurs, these greatly reduce chain slap noise and the risk of dropped chains through rough terrain.
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In reverse of this, gear indicators are a feature often lost as the groupset price increases. The theory being that more experienced riders use gears based on ‘feel’ and don’t need numbers or indicators to help them.

Alivio M4000

Shimano Alivio received a total revamp in 2015. The 9-speed groupset offers hydraulic disc brakes, multiple gearing options and a lighter and more durable crank design

Shimano Alivio received a total revamp in 2015. The 9-speed groupset offers hydraulic disc brakes, multiple gearing options and a lighter and more durable crank design.
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Shimano Alivio sits just above Acera. Like Acera, this 9-speed group is available with a triple or double crankset. We consider Alivio Shimano’s starting point if you’re seeking a trail-worthy mountain bike.

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