K tec Coilovers

Do also remember the tyre is one of the suspension components. To do this properly you would fix your spring rates around your tyres capabilities. Cup Race car spring rates will have been set around the characteristics of the Michelin Slick (and new ones at that) I would also expect that teams were allowed to pick their own spring rates, not have one size fits all imposed on them. The point of this is that there is no "ideal" spring damper, bushing etc. set up that is ideal for all cars but it is down to what works your on your choice of components, which includes the tyre.