The ROCKSHOX Deluxe R A1-B1 / Deluxe Select B2 47.5-55 mm Rear Shock Damper Shaft is a spare part designed for use in suspension systems on mountain bikes. This silver damper shaft is compatible with various models of ROCKSHOX rear shocks, ensuring a smooth and reliable performance on the trails. The shaft measures between 47.5-55 mm in length, offering an adjustable ride height to suit different riding preferences. Made from high-quality materials, this rear shock damper shaft is built to withstand the rigors of off-road cycling, providing enhanced control and comfort for a more enjoyable riding experience.