STONEDER Rear Shock Spring 800Lbs 170mm For Pit Dirt Bike Motorcycle Motocross This rear shock spring is designed for pit dirt bikes and motocross motorcycles.It has a spring rate of 800 pounds per inch and a length of 170 millimeters.The spring fits standard rear shock assemblies and provides consistent performance under riding conditions.Constructed from steel, it supports suspension function and helps maintain ride stability.Suitable for use in off-road applications where suspension response is required. This product is an aftermarket solution.Brand names are mentioned only to clarify compatibility with specific models.