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.
Weight:
110g per set 40/27, 95g per set 38/25
Sizes:
Outer - 40, 38t
Inner - 27, 25t
Characteristics:
- 100% CNC-machined, 7075-T6 aluminum alloy
- Aero design and reinforced rigidity
- Steel shifting pins
- 3 OCP points (2-3-4)
- Designed to work with all 9, 10 and 11 speed group sets