The X-Glide 11-speed Chain Ring was designed using the same upshift rivets that are used in SRAM's fast shifting XX mountain group set. This makes for smooth movement between front gears when using one of its Yaw derailleurs. The X-Glide chain rings were CNC machined using 7075-T6 aluminum which means that every aspect of the chainring receives precise control of shape and ramp. The chain rings are 5mm thick which gives them added stiffness. Although sold separately, the chain, chainrings, and front derailleur are designed as a single integrated system and in doing so, SRAM ensures that you'll always be in the gear your legs need. The SRAM X-Glide 11 Speed Chain Ring comes in two sizes: 50 and 52-ttoth. They both feature a 110BCD.