| Most coilover spring rates are in the range of 6-8 Kg/mm or 335 lbs/in to 450 lbs/in. OEM Spring Rates are: TT Front: 168 lbs/in or 3.0 Kg/mm TT Rear: 134 lbs/in or 2.4 Kg/mm Eibach Spring Rates (Progressive Rates) as quoted by an Eibach tech rep TT Front: 182 lbs/in upto 251 lbs/in (3.3 Kg/mm to 4.5 Kg/mm) TT Rear: 142 lbs/in upto 199 lbs/in (2.5 Kg/mm to 4.6 Kg/mm) Here is a handy conversion calculator: Spring rate conversion: lbs/inch to Kg/mm
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