About Progressive Progressive Suspension has focused exclusively on American V-twin suspension since 1982, and its Monotube fork cartridges and 400/970/970G shock series are among the most common upgrades on baggers and Softails. For most riders the stock rear shock is the single worst part on the bike — this is the fix. The Progressive 412 Series Shocks are a proven upgrade for Harley-Davidson riders seeking improved suspension performance and reliability. These shocks feature a durable double-wall steel body and nitrogen-charged damping. Why riders pick this Improves ride quality and handling Durable double-wall steel body Nitrogen-charged for consistent damping 5-position cam-style preload adjustment Available in multiple spring rates and finishes Designed to deliver consistent performance, the 412 Series offers a significant improvement over stock suspension, enhancing both ride quality and handling dynamics. Their accessible price point makes them a popular choice for riders looking to elevate their V-twin experience. Reliable Damping and Custom Tuning Durable double-wall steel damper body construction High-pressure nitrogen gas charged for consistent performance Multi-stage velocity-sensitive damping for varied road conditions 5-position cam-style preload adjuster for easy tuning Available with various spring rates and finish options Enhance Your Ride These shocks are an excellent foundation for any suspension upgrade, offering adjustability to match your weight and riding style. Whether you're cruising solo or loaded down with gear, the 412 Series helps maintain composure and comfort. Pair them with a Progressive front end kit for a fully balanced suspension system. Always confirm fitment for your specific Harley-Davidson model before ordering. Specifications Brand: Progressive Manufacturer Part #: 412-4001B Weight: 9.9 lb Category: Suspension / Shocks and Struts California Prop 65 Warning: Yes — see www.P65Warnings.ca.gov Common questions Can I adjust the stiffness or ride height after installation? Yes, the 5-position cam-style preload adjuster allows you to easily dial in the stiffness to match your weight and riding style without special tools. Ride height is determined by the shock length you choose. Are these shocks compatible with my Harley-Davidson? Progressive 412 Series shocks are available for many Harley-Davidson models. You'll need to confirm the correct shock length, mount configuration, and spring rate for your specific year and model using our Shop by Bike tool. What's the benefit of nitrogen-charged damping? Nitrogen gas charging helps prevent oil cavitation and foaming, ensuring more consistent and fade-free damping performance even during extended rides or spirited use. Ordering from Vtwinbikers Brand new, sourced through authorized US distribution — never used, never grey-market. Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order. Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride. {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://vtwinbikers.com"},{"@type":"ListItem","position":2,"name":"Shocks and Struts","item":"https://vtwinbikers.com/collections/all"},{"@type":"ListItem","position":3,"name":"Progressive","item":"https://vtwinbikers.com/collections/progressive"},{"@type":"ListItem","position":4,"name":"Progressive 412 Series Shocks - Harley-Davidson","item":"https://vtwinbikers.com/products/progressive-412-shocks-harley-davidson"}]} {"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Can I adjust the stiffness or ride height after installation?","acceptedAnswer":{"@type":"Answer","text":"Yes, the 5-position cam-style preload adjuster allows you to easily dial in the stiffness to match your weight and riding style without special tools. Ride height is determined by the shock length you choose."}},{"@type":"Question","name":"Are these shocks compatible with my Harley-Davidson?","acceptedAnswer":{"@type":"Answer","text":"Progressive 412 Series shocks are available for many Harley-Davidson models. You'll need to confirm the correct shock length, mount configuration, and spring rate for your specific year and model using our Shop by Bike tool."}},{"@type":"Question","name":"What's the benefit of nitrogen-charged damping?","acceptedAnswer":{"@type":"Answer","text":"Nitrogen gas charging helps prevent oil cavitation and foaming, ensuring more consistent and fade-free damping performance even during extended rides or spirited use."}}]}
