Conical Suspension Springs

Conical Springs are designed to provide a linear spring rate from free length to solid height while tapering from a 2.5” ID to a 5” OD.  They have a 5” OD like a conventional rear spring at one end and a 2.5” ID at the other end as is used on the most popular coil-over springs.  The 5” OD body diameter helps prevent bowing issues on these long, light-rate, high-deflection springs.  With the proper hardware, they can be used as coil-overs or conventional mount springs.

The 95#/in and 110#/in springs are offered in 18″ free lengths.  The 125#/in springs are only offered in 16″ free length.  Free lengths were determined to provide the maximum usable travel and spring load without having the ride height too high in the rear.

Circle Track Racing Suspension Components

Key Benefits of Conical Springs

  • More usable deflection
  • Less weight than standard suspension springs
  • 2% rate linearity tolerance from 20% to 60% of deflection
  • 4% rate linearity tolerance from 61% to 80% of deflection
  • Designed to fit all standard hardware
  • Maintain free length and rate throughout a near infinite operational life
  • Catalog: Page 22
1816SB0125 Conical Suspension Spring


Basic Specifications Applications
      • Free length range: 16” to 18”
      • Spring rates: 90#/in to 125#/in
      • Material: High tensile chrome silicone
      • Finish: Hyperco dark blue powder coat
      • Spring design: Ultra High Travel (UHT)
  • Motorsports:
    • Rear Suspension Setup for Circle Track Racing
    • Pavement Late Model Racing
    • Dirt Late Model Racing
2.5″ ID – 5″ OD SB-Series Conical Springs / 16″ Free Length
Part # Price
1816SB0125 $130.00
2.5″ ID – 5″ OD SB-Series Conical Springs / 18″ Free Length
Part # Price
1818SB095 $130.00
1818SB0110 $130.00