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Compatibility Shimano GRX cranksets including RX600 and RX810 Drop-Stop B tooth profile is compatible with SRAM Flattop chain Wolf Tooth’s patented Drop-Stop wide/narrow tooth profile provides the ultimate chain retention and mud-shedding ability Use Drop-Stop B for all 9, 10, and 11spd chains or 12spd SRAM Eagle, SRAM Flattop, Campagnolo, KMC, Connex or Wippermann chains