Sram Red eTap 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 and the diverse range bikes that they choose to ride. The recent development of the 10 tooth hardest gear for 12-speed cassettes has allowed Sram to re-think gear ratios to offer more range and a smoother gear progression. The Red AXS rear derailleur moves across this range harmoniously with one cage length fits all compatibility for any of the Red AXS cassette and chainset options. The derailleur utilizes an innovative form of the clutch system seen on mountain bike derailleurs known as Orbit technology. Sram engineered a silicon fluid damper specifically for road application that keeps the chain in check while placing absolutely no additional resistance on the shifting spring mechanism. The ergonomically designed electronic AXS shift-brake lever cancels out the variation in required shifting pressure over time that mechanical systems are subject to. There is also no delay whatsoever from pushing the paddle to derailleur movement. Reach adjustment in the levers mean they can always be perfectly positioned in your hand for a near telepathic shifting and braking experience. The Sram AXS mobile app allows the rider to personalize how the lever paddles control the groupset on the fly while also being able to view connected feedback on ideal service times and battery levels of all AXS parts. Sram suggest twenty hours shifting battery life on the rear derailleur, in other words enough juice for over 620 miles under typical shifting use, charging in the included cradle takes just one hour. The shift-brake lever takes one CR2032 lithium cell which should provide two years of battery life. Sram have taken a connected approach to all AXS lines meaning that you can pair any of the lever buttons with any other component within the AXS range. This means if you wanted to integrate a drop bar groupset with a Rockshox Reverb dropper seat post on a gravel bike it’s now as easy as dropping it into your frame and assigning it a button in the app. The rechargeable batteries can also be swapped between components and are exactly the same type used with Sram Eagle AXS and Reverb AXS.