MicroShift

Acolyte RD-M5185M-B SpringLock Rear Derailleur - 8 Speed MD Cage

microSHIFT Acolyte RD-M5185M-B SpringLock Rear Derailleur is an 8-speed rear derailleur designed for riders who want quieter drivetrain performance and better chain control on rough terrain without adding complexity. Its SpringLock chain retention system delivers added chain security when engaged, then quickly switches off for easier wheel removal and service—ideal for trail bikes, commuters on rough pavement, and mixed-surface riding where chain slap and drops are a concern.

• SpringLock chain retention - Adds chain security to help reduce chain slap and keep the chain in place over bumps, then disengages when chain control isn’t needed
• Two-step clutch control - Engage by turning the engagement bolt clockwise until it clicks (designed so it can’t be overtightened); disengage with the switch for simpler wheel removal
• Wide-range 8-speed compatibility - Built for 12-42T and 12-46T 8-speed cassettes for practical climbing range without jumping to higher-speed drivetrains
• Acolyte-only shift compatibility - Designed to pair specifically with microSHIFT Acolyte shifters for correct cable pull and consistent shifting
• Direct path cable routing - Promotes smooth, responsive shifting with a clean cable run
• Upgraded mid-cage design - Improves chain wrap and retention for better control across rough trails and choppy terrain