New from HPI is a 320 gf/mm addition to our lineup of Racing Shock Springs for the 2004 National Champion Pro 4 electric touring car. These springs offer a wide tuning range for racers, allowing fine tuning for improved handling on a variety of race tracks. Each spring features black plating with painted markings to help identify the different spring rates. For serious racers, the black plating is more consistent than a painted or powder coated spring. The ends of all of the springs are precision ground for a flat surface on the spring perches. These springs are optimized for the Pro 4, so they are slightly shorter and lighter than the springs for the original RS4 Pro/Pro2/Pro 3. To help aid in tuning, each spring is rated in gf/mm and comes with a handy spring chart. (sold in pairs)
