I thought I would check with KW but as Alex has suggested, the main spring p/n seems to indicate the spring rate and free length. The reply is below:
The 60N/mm spring is found in kits designed for a front axle weight of up to 950kg.
The 70N/mm spring is found in kits designed for a front axle weight of 951-1100kg.
Of course there is a tolerance on all springs.
However there is a difference between the stated spring wire diameter between the TUV documentation and the spec for the main spring in the KW catalogue, 10.8mm vs 10.5mm for the 70-170 for example. Not sure how Albert has come to the 87/67N/mm !
The 60N/mm spring is found in kits designed for a front axle weight of up to 950kg.
The 70N/mm spring is found in kits designed for a front axle weight of 951-1100kg.
Of course there is a tolerance on all springs.
However there is a difference between the stated spring wire diameter between the TUV documentation and the spec for the main spring in the KW catalogue, 10.8mm vs 10.5mm for the 70-170 for example. Not sure how Albert has come to the 87/67N/mm !
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