??Shred????you don´t usually take advice from the office recycling bin but your favorite trail begs to be ridden so you obey. QX2 chainrings for your double 104/64BCD cranks feature subtle 10% ovality that can be dialed in to take advantage of the most-powerful part of your pedal stroke to give you faster acceleration and better traction on whatever terrain you thrust under your wheels. QX2 offers?3 Optimum Chainring Positions (OCP), which can be adjusted to take?advantage of your pedal stroke's most-productive zone to propel you forward on each rotation.