This stunning model is immensely stiff & is completely hollow all the way to the spider. Its hidden bolt pattern makes better use of carbon fibre to further improve stiffness & shed weight. Furthermore, the stunning X Glide R chainrings are optimised for use with the Yaw Technology your front derailleur, delivering seamless, flawless performance. This is a perfect replacement for your old or worn-out existing chainset, so you can get back to enjoying fast acceleration & unbeatable pedal stroke performance. Technologies: X-Glide R Chainrings: The chainrings are designed for an optimized shifting performance with the Yaw front derailleur. The stiffer rings (5mm 7075-T6 aluminium CNC-machined) feature upshift rivets with an advanced design adopted from SRAM XX. CNC machining allows for precision control of each tooth shape, ramp, & nearly every shifting feature of the chainring. Chainrings, chain, & front derailleur are designed as a single integrated system for optimised performance. EX0gram: The new Hollow Carbon Construction starts in the crank arm & extends into the cranks’ spider. It maximises the stiffness to weight ratio.