The TranzX Replacement Cartridge for YSP23/YS105/YSP39 enhances dropper post performance with 170mm travel. It ensures smooth and responsive operation, making it an essential upgrade for your bike. Its durable construction guarantees longevity, and the straightforward installation process allows for quick replacements, ensuring more time riding and less time on maintenance. Ideal for mountain bikers seeking improved functionality and reliability on the trails. SKU: JD-PART-15Y23000019.