Sram CrankSet Red 172.5MM 11 Speed NEWFEATURES Exogram technology uses a large, hollow cross section all the way to the spider, minimizing weight while maximizing stiffness. Hidden bolt pattern leverages the characteristics of carbon fiber while presenting a sleek appearance X GlideR chainrings feature thicker construction and advanced shift timing pins and ramps, which are optimized for shifting with the Yaw front derailleur SRAM Road 11 speed compatible Compatible with SRAM RED eTap