All ICON shocks are rebuildable and the service interval greatly depends on the usage of the vehicle they are installed on. Application where most of the time the vehicle is used on streets and highways 50,000-80,000 miles can be achieved before a rebuild is required. Where dedicated off-road only vehicles can experience a service interval as short as 1,000 miles between rebuild. It’s recommended to routinely visually inspect shock for signs of damage or leaks.