The Shimano Altus RD-M310 is a 7/8-speed long-cage (SGS) rear derailleur in silver, built for reliable shifting on trekking and entry-level mountain bikes.

• 7 / 8-speed
• SGS long cage
• Max. sprocket 34T, total capacity 43T
• Works with double and triple cranksets
• Compatible with HG 6/7/8-speed chains
• Approx. 326 g
• Colour: silver