microSHIFT Acolyte RD-M5185-M Rear DerailleurThe microSHIFT Acolyte RD-M5185 rear derailleur is an 8-Speed derailleur that's compatible with wide-range 8-Speed cassettes up to 46-tooth. Ideal for trail, all-mountain and cross-country riding, this derailleur features a SpringLock chain retention to hold your chain in place and is compatible with microSHIFT Acolyte shifters only.Precise and Reliable Wide Range 8-Speed Gear ShiftingThe heart of the Acolyte derailleur is our innovative SpringLock system. By pairing a customized linear rate high tension spring and a dual stage activation mechanism, we've developed a system that can provide substantial chain security when you need it and can be turned off when you don't. To engage the clutch, turn the engagement bolt clockwise until it clicks. There's no way to overtighten the bolt. To disengage the clutch for wheel removal, flip the switch. It's that simple. Gear Ratios: Innovative SpringLock chain retention keeps chain in place over rough terrain Direct path cable routing for smooth and responsive shifting Compatible with 12-42T and 12-46T 8-speed cassettes Compatible with Acolyte shifters onlyFeatures: Series: Acolyte Model No.: RD-M5185M Compatibility: microSHIFT Acolyte Only Speed: 8-Speed Cage Length: Medium Cage Max. Sprocket: 42-46T Chain Capacity: 41T Clutch (Chain Stabilizer): Yes Attachment: Standard Mount Outer Link Material: Aluminium Cage Material: SteelBuy microSHIFT Components from Chain Reaction Cycles, the World's Largest Online Bike Store.