if the spring or wheel rate is on the soft side, how much bigger can a guy go up in sway bar size to compensate ? providing the bar sizes are correctly matched front and rear ?
Depends on the roll couple of your car's combo. Unfortunately it isn't a universal relationship.
My car can use a .92" t-bar and a 1.25" s-bar and have the same roll couple % as 1.12" t-bar and a 1.125" s-bar or a 1.22" t-bar and a 1" s-bar.
Add a rear s-bar and these all change. Rear bar mounting style also impacts rates as well since there are variations in this configuration as well.
