Shimano Acera 7/8-Speed MTB Rear Derailleur Long Cage Max 40 Teeth

The Shimano Acera RD-M3020-8 rear derailleur is designed for riders using a MTB or a 7 or 8-speed hybrid bike. The long cage handles sprockets up to 40 teeth.

• For 7 or 8-speed MTB and hybrid bikes, black
• SGS long cage: handles sprockets up to 40 teeth
• Total capacity of 45 teeth, suitable for wide gear ranges on climbs
• Mounts directly to a conventional derailleur hanger, without adapters
• Uses a Shimano HG 6/7/8-speed chain; not compatible with 11-28 cassettes

Technical specifications

• Model: RD-M3020-8 (Acera M3000 series)
• Speed: 7/8
• Cage type: Long (SGS)
• Maximum sprocket teeth: 40
• Minimum sprocket teeth: 11-12
• Total capacity: 45 teeth
• Maximum front chainring difference: 20 teeth
• Compatible chains: Shimano 6/7/8-speed HG
• Mounting: Directly to a conventional derailleur hanger
• Colour: Black

Founded in 1921 in Sakai, Japan, by Shozaburo Shimano, Shimano is still based in the same city today. For cyclists, it makes drivetrains, brakes, wheels, pedals and cycling shoes. Its history in bicycle components began with the production of freewheels in 1922.