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spring rate calculator
NameWire gaugespring diameter
(center of wire)
number of coilsModulous of...Spring rate
(kg/mm)
Spring rate
in/mm
41mm RaceTech .95 5.14 29.6 29.25 8420 0.96 53.6
41mm RaceTech .90 5.09 30 29 8420 0.9 50.2
41mm RaceTech .85 5.01 30.17 27.33 8420 0.88 49.1
41mm RaceTech .85 (2) 4.94 30.25 26.5 8420 0.85 47.4
41mm RaceTech .85 (3) 4.90 29.6 26.66 8420 0.87 48.6
41mm RaceTech .80 4.87 29.9 28.1 8420 0.78 43.5
mod'd F4(total) 4.85 32.67 21 8420 0.79 44.1
mod'd F4(final) 4.85 32.67 16 8420 1.04 58.1
43mm mystery F4 5.00 31.38 23.5 8420 0.9 50.2
'03 R6 spings 4.80 33.13 17 8420 0.9 50.2
'01 SV stock 4.75 30.51 25.875 8420 0.72 40.2
Traxxion, .90, for SV 4.78 29.70 22.125 8420 0.94 52.5
Penske/traxxion supplied shock spring
supposed to be 650lbs/in
12.32 70.82 7.375 8420 9.25 516.8
Ohlins shock/spring labled 1093-54/140 058 12.36 70.13 6.25 8420 11.39 636.4
Hyperco, 1,300 lbs/in 14.25 72.685 4.6666 8420 24.21 1352.8