Derailer - Rear - Shimano, Acera M3020

Shimano rear derailleur Acera M3020 Very unassuming and cheap sleeper rear derailer by Shimano but don't let that fool you.  You can officially use it with a cassette that has a cog as big as 40t.  Like this cassette here.  None of the other cheapy Shimano rear derailleurs can officially go as low. (The new Essa rear derailleur can go as low as 45t, but this one will work better with friction shifters).   CAGE LENGTH - SGS/Long TOTAL CAPACITY - 45T MAX FRONT DIFFERENCE - 20T MOUNT - Direct attachment (conventional) NUMBER OF PULLEY TEETH - 11T SERIES - Acera GENERATION - M3000 MAX LOW SPROCKET - 40T  MIN LOW SPROCKET - 30T REAR SPEEDS - 7/8 TOP NORMAL SPRING TYPE - Double servo