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.Drop-Stop chainrings are designed for use with 1x9 1x10 1x11 and 1x12 drivetrainsCompatible with all 10- 11- and 12-speed chains with the exception of Shimano 12-speed chainsShimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainringsIf using a 9-speed drivetrain use a 10-speed chain which will provide a tighter fit for better chain retentionUse of a clutch-style rear derailleur is recommendedMade from 7075-T6 aluminum for long life Color Black Ring Position/Type Chain Retaining Single Ring Tooth Count 30, 32, 34, 36, 38 Round or Oval Round Drivetrain Speeds 12 Chainring BCD 104 Material Aluminum Defined Color Black keyword search SRAM Transmission