Shock Springs

Lighter front springs

• More chassis roll / traction
• Less responsive
• Better handling of bumps

Stiffer front springs

• More responsive
• More corner speed if traction allows
• Less chassis roll / traction
• Better jumping and landing
• Ideal for high-grip tracks

Lighter rear springs

• More chassis roll / traction
• More traction
• Less responsive
• Better handling of bumps

Stiffer rear springs

• More responsive
• More corner speed if traction allows
• Less chassis roll / traction
• Better jumping and landing
  

Note that the shock collar (upper spring limiter) should only be used to set the car’s ride height, not to change the stiffness of the spring.  If you want to change the spring stiffness, you need to change the spring itself.

“Low frequency” springs have a higher coil count and less progressive feel.  They reduce chassis oscillation on rough surfaces, improving overall stability, grip, and corner speed.