Sram GX - Rear Derailleur Type 2.1 - 10 Speed - Black - Short 710845771811 | eBay
SRAM SRAM, XX1 Rear derailleur, 11sp, Type 2.1, Long cage, Black - SoCal Bike - Oceanside, Carlsbad and north San Diego county's favorite bike shop, Bicycle and ebike rentals, sales, and service