These chainrings are f or Shimano direct mount cranks. The Wolf Tooth chainrings feature our patented Drop-Stop® design for the best wear life, chain retention and mud clearance. Compatibility Shimano XTR M9100, XT M8100, and SLX M7100 series 12 speed cranksets. Super boost cranksets -models M8120, M8130, M7120 and M7130 - use the Boost chainring.  These Super Boost cranksets have a longer spindle and do not use the Super Boost chainring.  These cranks and ring should ONLY be used on bikes with Super Boost rear hub spacing (157mm) Boost cranksets - models M9100, M8100, M7100, MT610 - will use a Boost ring with Boost rear hub spacing (148mm) and a Super Boost ring with Super Boost rear hub spacing (157mm). [snippet name="DropStop A ST"] Recommendations If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur. Without these precautions, you may experience chaindrops and/or chainsuck. Related Products Direct Mount chainrings for Shimano cranks Shimano Hyperglide+ 12spd compatible chainrings Tech Specs Weight: 32 • 65g Material: 7075-T6 aluminum Made in the USA Patent and trademark information