SRAM 42 Tooth 107mm BCD x 4-Bolt 1x12-Speed X-Sync Chainring Blast Black battery only while bottom assemblies include crown

while bottom assemblies include crown race (Carbon indicates a carbon top cover)

Internal cable routing delivers a clean aesthetic

Infinite vertical adjustment between 28 and 36T for round chainrings and  28-34T oval chainrings

Reflective striping allows for night time visibility

5mm spindle spacers

SRAM 42 Tooth 107mm BCD x 4-Bolt 1x12-Speed X-Sync Chainring Blast Black battery only while bottom assemblies include crownSRAM 42 Tooth 107mm BCD x 4 Bolt 1x12 Speed X Sync Chainring Blast Black. SRAMs X Sync Road Chainrings are designed for provide maximum control when used with AXS road cranksets. 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 youre always in the right gear Can be installed with a single