Ride the Future of Suspension! 🚴♂️ Transform your motorcycle's suspension performance with cutting-edge technology. Standard progressive rate spring for a smooth, controlled ride. All steel double wall damper ensures longevity and reliability. High pressure gas charging delivers unmatched damping consistency. 5-position cam style preload adjuster for a customized ride. Heavy duty design High pressure gas charged 13" length The Progressive Suspension 412-4065B is a high-performance rear shock designed for street-sport motorcycles. With a durable all-steel construction, adjustable preload settings, and high-pressure gas charging, this shock offers superior suspension performance and comfort for riders seeking an upgrade.