microSHIFT Acolyte RD-M5180M-B Rear Derailleur - 8 Speed Medium Cage BlackmicroSHIFT Acolyte RD M5180M B Rear Derailleur 8 Speed Medium Cage Black. Not everyone needs the added chain retention provided by our innovative SpringLock system. For those riders microSHIFT offers a non clutch version of their Acolyte derailleur. While still capable of handling a 12 46t cassette the rear derailleur is the perfect choice for commuter or touring bikes that can benefit from using a wide range 1x gearing system. Direct path cable