RACE FACE 4-BOLT 12-SPEED SHIMANO CHAINRINGONLY FOR HYPERGLIDE+ CHAINSWhether you're upgrading to a 12-speed Shimano drivetrain or you're replacing a worn-out chainring, you'll want to consider the Race Face 4-Bolt 12-Speed Shimano Chainring. It is a narrow-wide chainring that is compatible with 104 BCD 4-bolt cranks. It's only compatible with Hyperglide + chains and is designed for use with 12-speed Shimano drivetrains. Features Only compatible with Hyperglide+ chains Designed for use with 12-speed Shimano drivetrains Narrow-wide tooth profiling ensures consistent chain retention SPECIFICATIONSDrive Train Speed12Tooth Count34TBolt Center Diameter104Material Aluminum Intended Use Mountain Weight- | Race Face | 4 Bolt 12 Speed Shimano Chainring | Black | 34 Tooth, 104 Bcd | Aluminum