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