Oval spiderless retainer ring boost the hope oval direct mount retainer ring has a narrowwide tooth configuration designed for 1x10 and 1x11 set ups without the need of a chain guide and specifically for use with boost framesets oval direct mount retainer ring to suit our cranks saves weight without need for a seperate spider able to run a broader range of smaller chainring sizes for use with boost specific frames to achieve an optimal chainline 12 ovality and 113 deg clocking the narrowwide