Why reinvent the wheel when you can reinvent the chainring? The absoluteBLACK Race Face Direct Mount Boost Oval Chainring increases pedaling effectiveness by conserving energy through the weakest part of your stroke, and maximizing power transfer through the strongest. The result is a remarkably smooth pedal stroke that keeps the legs feeling great during heavy climbs. It's science, and it works! Optimized for use with 10, 11, and Eagle 12 speed rigs, this chainring will keep you going long after the homies have tapped out.