microSHIFT Acolyte Super Short Rear Derailleur - 8 Speed Super Short Cage BLK With SpringLockmicroSHIFT Acolyte Super Short Rear Derailleur 8 Speed Super Short Cage Black With SpringLock. Delivering full sized performance in a compact sized package the Acolyte Super Short rear derailleur provides a full set of features for off road riding on a platform thats compatible with small wheel sizes down to 20". With the same features as the standard sized Acolyte you can ride Super Short as hard as you want no matter how tall you stand. TECH SPECS