Hot Racing 40x14mm Rear Progressive Spring Set [SOFE40MR148]

40x14mm Rear Progressive Spring Set


Hot Racing 



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Optional Multi rate Spring Set for the Losi 1/14 Shocks used on the Rear of the Mini 8ight


  • Spring Steel Construction
  • Progressive Rate Springs (PRS) allow for the optimum spring rate for each application. These multirate springs are soft at the beginning to soak up the small bumps, but transitions (crosses over) to the stiff part of the rate to resist bottoming on jumps and other big "hits. "

In the Package:

  • Two 1.0mm wire black PROGRESSIVE Rate Springs
  • Two 1.2mm wire Silver PROGRESSIVE Rate Springs
  • Two 1.3mm wire Gold PROGRESSIVE Rate Springs


  • Black
  • Length: 40mm
  • Inner diameter: 14 mm
  • Wire diameter:1.00Turn 9
  • Silver
  • Length: 40mm
  • Inner diameter: 14mm
  • Wire diameter:1.10Turn 9
  • Gold
  • Length: 40mm
  • Inner diameter: 14mm
  • Wire diameter:1.3Turn 9


  • Hot Racing progressive springs each coil is spaced differently and have a variable spring rate. When free, it is easy to compress progressive springs for first few mm. As you apply more forces, coil on a progressive spring come closer. After a certain point, coil at both end of progressive springs becomes inactive, and that makes the spring stiffer. Apply more forces to mid part of the progressive spring then it becomes stiffer because as the number of active coils in a spring decreases, the spring rate increases. So, progressive springs may both be sensitive to very small bumps on the road, while giving the stiffness you need during hard braking and turning

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