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 Inner - 27, 25t. 100% CNC-machined, 7075-T6 aluminum alloy.
Aero design and reinforced rigidity. Designed to work with all 9, 10 and 11 speed group sets. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Chainrings & BMX Sprockets". The seller is "bikengears" and is located in this country: US. This item can be shipped worldwide.