This left drive sprocket assembly is designed specifically for Stairmaster steppers, offering a seamless replacement solution for your fitness equipment. The sprocket assembly comes complete with a bearing, which is installed with the writing on the "sprocket" side, ensuring proper alignment and smooth operation. This replacement part is compatible with a range of Stairmaster stepper models, including the 4000PT, 4100PT, 4200PT, 2400PS FreeClimber, 4600CL, FreeRunner 5400, 4400CL, 4400PT, and 4600PT. With this high-quality sprocket assembly, you can get back to your workout routine with confidence, knowing that your equipment is operating at its best. The Stairmaster brand is renowned for its commitment to quality and performance, and this replacement sprocket assembly is no exception. By choosing this authentic Stairmaster part, you can ensure that your stepper is running safely and efficiently, providing you with a great workout experience. With its durable construction and precise engineering, this left drive sprocket assembly is built to last, providing you with years of trouble-free operation. Whether you're a fitness enthusiast or a gym owner, this replacement part is the perfect solution for keeping your Stairmaster stepper in top condition. By choosing this genuine Stairmaster part, you can trust that you're getting a product that meets the highest standards of quality and performance. This left drive sprocket assembly is a crucial component for ensuring the smooth operation of your Stairmaster stepper, and with its ease of installation, you can get back to your workout routine in no time. With its compatibility with a range of models and its durable construction, this replacement sprocket assembly is an essential investment for anyone looking to maintain their Stairmaster stepper. By keeping your equipment in top condition, you can ensure a safe and effective workout, every time. This left drive sprocket assembly is the perfect solution for anyone looking to replace a worn or damaged part, and with its Stairmaster branding, you can trust that you're getting a product that meets the highest standards of quality. Whether you're looking to replace a worn sprocket or simply want to keep a spare on hand, this left drive sprocket assembly is the perfect addition to your Stairmaster stepper maintenance kit. With its ease of installation and durable construction, this replacement part is the perfect solution for anyone looking to keep their equipment running smoothly. With the Stairmaster brand, you can trust that you're getting a product that is designed to last, providing you with years of trouble-free operation and a great workout experience.