TSR (Tall-Short-Ring) 1X chainrings are designed to work with all modern 10/11/12 speed 1X drivetrain systems. The tall/short tooth profile helps prevent the chain from falling off the ring when riding through rough terrain and is a must on 1x drivetrains but is also compatible with singlespeed drivetrains. Made in our shop from U.S. sourced 7075-T6 aluminum (48 tooth ring is 6061-T6). - Fits White Industries MR30 cranks only - Works with SRAM 10/11/12 speed and 12 speed flat-top chains - Works with Shimano 10/11/12 speed chains - Works with singlespeed 3/32 chains - Available in silver and black - From 28 teeth to 48 teeth in 2 tooth increments Boost and non-Boost versions: - Standard/non-boost rings have a 3mm offset (inward) - Boost rings are flat (so 3mm outward of our standard/non-boost rings) - Standard/non-Boost rings can be flipped to give you 3mm more outward offset than our Boost rings)