Can be used for 1X or 2X systems. I used one of these on a kids 2X as the big ring, with 24t small ring for climbing. Did not use a derailleur, just manual chain placement. More likely this will be used on 1X adult use bike with wide range cassette.
I-10 and Chandler Blvd
See the "more ads by this user" link for more of my mtb surplus parts and tires