The White Industries ENO rings have now been improved to feature a wide-narrow tooth profile known and loved for its chain retaining properties. But wait, there's more! The tooth profile is also alternatingly tall and short (thus TSR for tall short ring). This combination makes it super reliable and astonishingly quiet. Use these lovingly machined (in the U.S.A.) rings with their square taper ENO or Road cranks for all of your single-speed or 1x (one-bye) applications.<br /><br />*For square taper White Industries crank arms only. These will NOT work with MR30 series cranks. Like...not even a little bit!