The microSHIFT Acolyte 8-Speed Medium Cage Rear Derailleur with SpringLock Chain Retention (Model: RD-M5185M) is a heavy-duty, entry-level 1x8 drivetrain component. It introduces off-road clutch technology to budget-conscious mountain bikes, commuter rigs, and kids' bikes.

Key Technical Specifications

• SpringLock Clutch:
  Equipped with a specialized clutch system featuring a linear-rate high-tension spring and a two-stage activation mechanism. Turning the engagement bolt clockwise locks the clutch to isolate chain slap, while flipping the integrated switch releases tension for effortless rear-wheel removal.
• Gear & Cassette Limits:
  Optimized entirely for wide-range 1x8 setups, supporting 12-42T and 12-46T cassettes with a total chain wrap capacity of 41 teeth.
• Direct Path Cable Routing:
  Feeds the mechanical shift cable straight into the anchor bolt without restrictive housing bends, ensuring responsive shifting action.
• Material Composition:
  Combines a resilient steel cage assembly with a lightweight aluminum outer link to handle impacts on rough terrain.
• Compatibility Constraint:
  Operates on a proprietary pull ratio and is strictly compatible with microSHIFT Acolyte index shifters only. It cannot be paired with Shimano or SRAM 8-speed shifters.