SRAM Red Yaw 39T 10-Speed Hidden Bolt Chainring Use with 53TSRAM Red Yaw 39T 10 Speed Hidden Bolt Chainring Use with 53T. Tooth shapes and shift pins are designed specifically for use with SRAM Yaw front derailleurs. Compatible with the SRAM Red Yaw front derailleur 7000 series aluminum provides strength and durability TECH SPECS Tooth Count 39 Ring Position Type Inner Drivetrain Speeds 10 Chainring BCD 130 Color Black Defined Color Black Material Aluminum