The Progressive Suspension 412 Cruiser Series is a rear‑mount coilover monotube shock absorber built from steel and finished in a sleek black or chrome exterior. Each unit extends to 12.00 in, delivering a standard‑duty, gas‑charged damping system with an internal reservoir that maintains consistent performance under street‑oriented riding conditions. Designed as a single progressive‑rate spring, the shock provides a measured increase in stiffness from 3.75 kg/mm to 4.50 kg/mm (210 lb/in to 250 lb/in), allowing the suspension to adapt smoothly to varying load inputs while preserving ride quality.
The 412 Series employs an automatic adjustment style, eliminating the need for manual tuning and ensuring optimal damping response across a range of road surfaces. Available as a matched pair, the shocks are specified for Honda, Kawasaki and Triumph applications, making them a versatile upgrade for riders seeking reliable rear‑suspension performance without compromising the original chassis geometry. Their street‑focused design and progressive spring rate combine to enhance handling precision while maintaining comfort on everyday rides.