Wow, that's one complex system of radius rods
I'm not really sure what it is that they are trying to achieve. Perhaps reduce the longitudinal (for and aft) compliance in the lower control arm inner and rear bushes. But the addtiional of radius rods would do nothing for the lateral and vertical compliance. It maybe of some use in a drag racing environment where the elimination of longitudinal movement would be of slight benefit, limiting caster change. But it would do nothing for maintaining camber or toe, so of very little use in road and/or circuit car.
Plus I'm not a big fan of spherical bearings in road cars, they are very exposed, have no dust covers or greasing points and they look somewhat undersized for my liking. My guess is they would need cleaning and greasing regularly and replacing frequently.
A much better solution would be to replace the bushes with polyurethane and fit a caster kit. That way you have the benefits of additional caster plus the full 360 degree improvement in rigidity from the polyurethane bushes (over the standard rubber).
Cheers
Gary







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