Sram Red e Tap AXS is much more than a simple evolution of its predecessor, it is a revolution, a fully integrated approach to design a groupset that empowers ever more capable riders & the diverse range of bikes that they choose to ride. With the advent of AXS Sram took the opportunity to redesign the fundamental chain. The new Red chain is visibly different with a proprietary Flattop technology design that increases the strength of the links to allow for a narrower chain width. Despite the reduction in overall chain width there is actually an increase in the space between the links for quieter operation & enhanced durability. Sram Hard Chrome inner link plates & rollers reinforce this durability by reducing wear on the parts of the chain that mesh with the teeth of the drivetrain for a prolonged life. This chain is designed to work harmoniously with Sram X-Sync chaining technology to help retain a deflected chain even over rough terrain.