It could be argued that no other component innovation in the past decade has changed the way we ride mountain bikes like the dropper post. Today most of us can't imagine riding without one and dropper posts needs to be fully trustworthy. e*thirteen has been engineering droppers since the beginning, and over those years learned many ways to improve overall function, durability, adjustability, and ease of service. We're proud to say that our newest dropper, the VarioTM Infinite Dropper Post sets the benchmarks for reliability. Our dropper comes in a wide range of sizes and travels to ensure optimal fit for any rider or frame design. The tool free travel adjustment and serviceability allows an adjusted travel in seconds, or rebuild in minutes. These features are offered with a Lifetime Warranty on the gas cartridge to ensure you have absolute confidence and nothing but worry free rides.