SRAM X-Sync Road Direct Mount Chainring Rival - 40t 12-Speed 8-Bolt Direct Mount BLK MFPN=RB21EC90AX16D44 Lock it down

Lock it down

} Made of tough Duraluminum 35 g 4

with extreme durability

** The XP4 is also certified to UL 2849

SRAM X-Sync Road Direct Mount Chainring Rival - 40t 12-Speed 8-Bolt Direct Mount BLK MFPN=RB21EC90AX16D44 Lock it downSRAM X Sync Road Direct Mount Chainrings for Rival drivetrains feature a wide tooth narrow tooth design to provides maximum chain control. SRAM X SYNC wide tooth narrow tooth chainring technology provides maximum chain control Laser etched chainring finish is more durable X Range gearing technology gives you more range and a smoother gear progression so you're always in the right gear Tooth Count 40 Drivetrain Speeds 12 Round or Oval Round Defined