Engineered with performance and control as primary objectives, the shock structure has seen a redesign in order to be more robust to use on the Sur Ron and Segway Dirt Ebikes. The hydraulic bottom-out circuit (HBC) has been enhanced with a wider range of adjustment, in order to prevent bottom-out issues, while allowing riders to use softer spring rates and providing excellent support and end stroke characteristics. This is a purpose built shock specifically made for the Sur Ron and Segway bikes. These shocks come with one spring.