absoluteBLACK Direct Mount Narrow Wide Chainring - SRAM Direct Mount - 3mm Boost - Oval - Black - 12 Speed Shimano - 30T YGroup_7033415794733 Mounting standard: These are Centerlock

Mounting standard: These are Centerlock rotors

Ultralight 8mm Hex Wrench Insert - pedal removal and other 8mm hex applications

Shimano Direct mount for interchangeability

BARREL - Butted aluminum

16 notch: GXP (older SRAM)

absoluteBLACK Direct Mount Narrow Wide Chainring - SRAM Direct Mount - 3mm Boost - Oval - Black - 12 Speed Shimano - 30T YGroup_7033415794733 Mounting standard: These are CenterlockabsoluteBLACK is dedicated to producing the world's finest oval chainrings and were the first to crack the code to discover the correct shape and 'clocking' to make an oval chainring work. They learned how to maximize the part of the stroke where power is produced and minimize resistance where it isn't. The oval shape smooths the delivery of power throughout the pedal stroke and improves efficiency and energy conservation. Many other brands have