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Shimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainrings. Drop-Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrains. Tooth Count 42. If using a 9-speed drivetrain, use a 10-speed chain, which will provide a tighter fit for better chain retention.