IONIC_FIT: The human body is neither cylindrical nor symmetrical

The compact design delivers up to 500 lumens with eight different modes

Includes mount to fit to bottle cage bolts

This model replaces the older SM-HB20 Lock Ring

Waterproof Rating: IP-67 waterproof rating

absoluteBLACK Direct Mount Narrow Wide Chainring - SRAM Direct Mount - 3mm Boost - Oval - Gold - 9-12 Speed - 28T Ignore Wholesale Tier 1 Brand Rule IONIC_FIT: The human body isabsoluteBLACK 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