SPC vs Icon Delta Joint

looks like a more aggressive caster alignment will fix that.

 

You'd never forgive yourself

 

I'm pretty sure the only way you can adjust Caster is by moving the top of the spindle forward or back. That is exactly what Caster is.

 

The cam adjustments down at the LCA allow for caster adjustment.

 

Caster is the amount of angle in relation to the upper and lower ball joints compared to vertical. The reason people like SPC's is you can push the wheel further forward (from the lower control arms) and still have +3 degrees caster. If you adjust the lower control arm cams so the rears are pushing the control arm out and the fronts pulling the control arm in it moves the lower ball joint forward. Now you adjust camber and caster using the upper ball joint. This allows you to have more clearance with 3 degrees caster than using a fixed upper control arm and using the lower control arm cams to make your adjustments. The reason no 2 trucks are the same and that one truck can rub and another doesn't with X amount of caster is because there are many ways of getting there.