Shimano RD-M310 Rear Derailleur (Altus, 7/8-Speed)
What Is It?
The Shimano RD-M310 Altus is a rear derailleur designed for 7- and 8-speed mountain bike drivetrains. It shifts the chain across the rear cassette, providing reliable gear changes for entry-level MTB, hybrid, and commuter bikes.
It is one of Shimano’s most widely used budget-friendly rear derailleurs, known for simplicity, durability, and easy compatibility.
Key Features
- Compatible with 7- and 8-speed drivetrains
- Part of the Shimano Altus MTB group
- Long cage design for triple or double crank setups
- Smooth, light shifting action
- Wide pulley design reduces noise and wear
- Supports up to ~34T large rear sprocket
- Works with Shimano HG 7/8-speed chains
- Simple and durable construction for everyday riding
Specifications
| Specification |
Details |
| Brand |
Shimano |
| Model |
RD-M310 |
| Series |
Altus |
| Speed |
7/8-speed |
| Cage Length |
SGS (long cage) |
| Max Sprocket |
~34T |
| Total Capacity |
~43T |
| Compatibility |
Shimano 7/8-speed MTB shifters |
| Mount Type |
Standard derailleur hanger |
| Use |
MTB, hybrid, commuter |
Who Is It Suitable For?
- Mountain bikers using 7 or 8-speed systems
- Commuter and hybrid cyclists
- Entry-level MTB riders
- Riders replacing worn Tourney or older Altus derailleurs
- Bikes with triple cranksets
- Budget rebuilds or repairs
Who Should Use It?
- Riders with Shimano Tourney / Altus 7–8 speed setups
- Cyclists needing a reliable, low-cost replacement derailleur
- Casual MTB riders on light trails or roads
- Commuters needing simple, dependable shifting
- Bike mechanics servicing older Shimano drivetrains
- Riders not upgrading beyond 8-speed systems
