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Hi Craig,
It would be my best guess that you would wish to be in the area of 140 for all around use.
Wheel rates for soft street use should be 120-125.
Wheel rates for "sports" type use 135-140.
Road course use (depending on chassis stiffness) 160-180. (stiff chassis) These numbers can be mush higher on a flexible chassis.
Hope this helps a bit.
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