Abstract: This disclosure is directed to suspension assemblies for vehicles. More specifically, this disclosure is directed to secondary springs for suspension assemblies of vehicles. In some embodiments, a secondary spring can comprise a base, a tip, and one or more extension members positioned between the base and the tip that are configured to be removably coupled to the base and/or the tip to adjust a length of the secondary spring. In some embodiments a user can adjust the length of the secondary spring, so that the secondary spring is compatible with a given coil spring of the suspension assembly, by increasing or decreasing the number of extension members included in the secondary spring and/or by replacing one or more of the extension members with longer or shorter extension members.