The Original one and only Absoluteblack Premium Sram compatible Direct mount 1X Oval BB30 chainrings are designed for BB30/PF30 SHORT spindle cranks. Chainring is flat (0mm offset). Fits BB30 XX1, X01 and others. They are also 100-percent optimized for Eagle 12spd.Size (Weight):30T (52g)32T (57g)34T(66g)Compatibility:ÊSRAM XX1, XX1 Eagle, X01, X01 Eagle, X0, X9, X7, S2210, S1400 and Truvativ AKA cranks. BB30 short spindle only. Also fits for Fatbikes with GXP spindle! 9, 10, 11 and 12spd Eagle compatible.Materials: CNCÊmachined 7075 Txxx Aluminum. Long-lasting constructionChainline: 49mm. 0mm offsetMounting: Direct MountOvality: Optimized to each size separately. Range: 10.2-14.4% and Timing of 110.5-116.3¡ after TDC (top dead center) Patent PendingAdvantages of our special Oval chainrings:Finest design to provide excellent weight to strength ratioOne of a kind special oval shape (Patent Pending)Unique Patent Pending narrow-wide teeth profiles to keep your chain in place for minimum 12 months!Special 3D teeth machining for ultimate mud relief decrease wear and noise dramaticallyDesigned to handle mud and grass with easySuperb quality and great look.You will ride faster using ovals. If you keep using round ring then others will get quicker.Reduces stress on knees and helps to maintain your legs fresher for longer.You will not feel the oval shape at all.