A practical choice for anyone replacing a compatible 7- or 8-speed MTB rear derailleur or keeping an older everyday bike running reliably.
The Shimano RD-M310 is an ALTUS MTB rear derailleur for compatible 7- and 8-speed drivetrains. It is a sensible choice when you need a dependable replacement or are refreshing an older bike without moving to a more complex groupset.
A Wide Link design adds rigidity around the derailleur body, helping the mechanism maintain accurate shifting. The Advanced Light Action system reduces the effort required at the shifter, making frequent gear changes feel easier and more responsive during everyday riding.
Shimano’s SMART CAGE pulley plate works with a 13-tooth guide pulley and an oversized 15-tooth tension pulley. This MegaPulley arrangement is designed to support smooth chain movement while reducing drivetrain noise and pulley wear. The derailleur has a 43T total capacity, but compatibility still depends on the rest of your drivetrain, including the shifter, cassette, chain and chain length.
7/8-speed compatibility
Designed for compatible 7- and 8-speed drivetrains, making it suitable for many older and entry-level MTB setups.
43T total capacity
Provides useful range for drivetrains with a broad spread of rear sprocket sizes; confirm your complete drivetrain setup before fitting.
Wide Link design
The wider link increases derailleur rigidity to help deliver more precise rear shifting.
Advanced Light Action
The light-action mechanism makes gear changes easier and more responsive at the shifter.
Oversized pulley arrangement
A 13T guide pulley and 15T tension pulley support smooth chain movement while helping reduce noise and wear.
SMART CAGE pulley plate
The pulley plate is designed around the oversized pulley system for quiet running and durability.
Black finish
A clean black finish suits a wide range of MTB and utility-bike builds.
General
Features
Colours
Wide Link
The wider link design increases derailleur rigidity, helping deliver more precise rear shifting.
Advanced light action
The light-action mechanism makes gear changes easier and more responsive at the shifter.
MegaPulley
The larger pulley system is designed to reduce drivetrain noise and pulley wear while supporting smooth chain movement.
SMART CAGE
The SMART CAGE pulley plate uses an oversize pulley arrangement to improve quiet running and durability.
Shimano is a Japanese component brand founded in 1921 in Sakai, Osaka. The company began with bicycle component manufacturing and has grown into a global business focused on bicycle components, fishing tackle and rowing equipment, while keeping its headquarters in Sakai.
In cycling, Shimano is best known for building complete component ecosystems that span road, mountain, gravel, commuting and e-bike use. Its range covers drivetrains, brakes, wheels, pedals, shoes and related parts, and the brand has had a long presence in Australia through a local business established in Sydney in 1992.
