Premium 1X Oval 96bcd narrow wide chainring designed for Shimano XT M8000, SLX M7000, MT700, MT610 & M5100 1x or 2x cranks Only. These chainrings fit Boost and non-boost bikes as correct offset is realized by the crank spider itself. Bolts included. This particular chainring will ONLY work with CN-M9100, 8100, 7100 & 6100 12spd Hyperglide+ chain due to different thickness & shape of the teeth. It is the most Premium oval chainring on the market with scientifically proven performance gains.