Why reinvent the wheel when you can reinvent the chainring? The absoluteBLACK Shimano Direct Mount 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 feels great during heavy climbs. It's science, and it works! Designed for use with Shimano cranks and 12spd Hyperglide+ chains, this chainring will keep you going long after the homies have tapped out.