120 BCD cranksets were introduced with SRAM 2x10 drivetrains and are excellent candidates for a 1x conversion with our patented Drop-Stop chainrings. These rings will allow you to convert your 120 BCD crankset, like the SRAM XX and others, to a 1x application! Compatibility: - These rings fit any 120 BCD crankset or spider. - For SRAM cranksets you must use the stock M8.5 bolts. These are not standard bolts and Wolf Tooth's bolts will not work with this chainring. Note that only about 3 threads will engage (same with the stock SRAM rings) - For the 36t chainring and non-SRAM cranksets you will need the M8.5 bolts from Wickwerks if your crankset doesn't already have them. These bolts actually have more threads engaged and will work better than the SRAM ones. - 36t is the smallest number of teeth that fits on a 120 BCD - For 1x9, 1x10, 1x11 and 1x12 drivetrains (including SRAM Eagle) - Compatible with all 10, 11, and 12 speed chains (Including SRAM Eagle) - If using a 9 speed drivetrain use a 10 speed chain (shifts and works well on a 9 speed drivetrain and fits the ring tighter for better chain retention).