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Steering Block Bushings for the HPI RS4 PRO 4 & HB Cyclone.


  • Steel construction Flanged bushings


  • Inside diameter: 3mm (.11")
  • Outside diameter: 4mm (.17")

A package of replacement Pivot Balls for the HPI RS4 Pro 4 and HB Cyclone.

These pivot balls fit onto the ends of the suspension shafts.

Strong heavy duty nylon

Black in color


  • Eight 4.3 x 18mm Heavy Duty Ball Cups
  • One Ball Cup Holder (used to hold ball cup while tightening)
HPI Pro4 Spring Set 75175
Our Price: US$30.00

Tune your touring car to perfection with a complete range of HPI Racing springs, in one convenient package.

You get 7 pairs of springs specifically tuned by our Team Drivers for racing action, ranging from 273 gf/mm to 400 gf/mm, and colour coded for easy identification.


  • Two Springs Blue Rated 15.3 in/lb
  • Two Springs Silver Rated 16.9 in/lb
  • Two Springs Pink Rated 18.0 in/lb
  • Two Springs Gold Rated 19.0 in/lb
  • Two Springs White Rated 20.3 in/lb
  • Two Springs Yellow Rated 21.7 in/lb
  • Two Springs Red Rated 22.4 in/lb


  • Length: 25mm
  • Diameter: 17.18mm Outer, 14.68mm Inter.