Featuring the proprietary mud clearing Drop-Stop tooth design, these rings are designed to fit any 104 BCD crankset. Made in Minneapolis, MN with exceptional chain retention in mind, these chainrings are best paired with a clutch-style rear derailleur.Features-Drop-Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrains-Compatible with all 10-, 11-, and 12-speed chains, with the exception of Shimano 12-speed chains-Shimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainrings-If using a 9-speed drivetrain, use a 10-speed chain, which will provide a tighter fit for better chain retention-Use of a clutch-style rear derailleur is recommended-Made from 7075-T6 aluminum for long lifeItem Specifications-Color:Black-Ring Position/Type:Chain Retaining Single Ring-Tooth Count:30-Round or Oval:Round-Drivetrain Speeds:9-Drivetrain Speeds:10-Drivetrain Speeds:11-Drivetrain Speeds:12-Chainring BCD:104-Material:Aluminum-Defined Color:Black