SRAM X-Sync Chainring 42 Teeth 110mm BCD Polished Grey/Matte BlackSRAM X Sync Chainring 42 Teeth 110mm BCD Polished Grey Matte Black. SRAM X Sync chainrings feature tall teeth with alternating tooth profiles that hold the chain amazingly well and still provide space for mud to clear. Full CNC AL rings TECH SPECS Tooth Count 42 Ring Position Type Chain Retaining Single Ring Drivetrain Speeds 10 Drivetrain Speeds 11 Chainring BCD 110 Color Silver Black Defined Color Silver Material Aluminum