This model replaces the older SM-HB20 Lock Ring

Works with: E-bikes and standard bicycles

10-speed only

6 Top / ZS49/30 Bottom - to suit frames with a 49mm internal diameter top and bottom and 1 1/8th steerers only

Weight 125 grams

absoluteBLACK Direct Mount Narrow Wide Chainring - SRAM Direct Mount - 3mm Boost - Oval - Gold - 9-12 Speed - 28T Ignore Wholesale Tier 1 Brand Rule This model replaces the olderabsoluteBLACK 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