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Shimano Saint RD-M820-SS1 Rear Derailleur - 10 Speed, Short Cage, Black Shimano Saint RD-M820 Rear Derailleurs. Shimano Saint RD-M820 Rear Derailleurs. Every bike we list is owned, inspected, and held by us; we donât consign or list for others.

Allows use of a larger cassette it’s in the derailer’s user manual I had to order this part from overseas and ordered 3 of them one to use and two to sell