WOLF TOOTH 40T GC COG FOR SRAM 11-36 10-SPEED CASSETTES, BLACK, BLKGC40SRAM
MPN: BLKGC40SRAM. Compatible only with the following SRAM 11-36 and 12-36 cassettes: PG-1030, 1050, 1070 and the XG-1080. Not compatible with 2011 or older SRAM rear derailleurs. Tooth Count: 40.