I have 300# rate springs in the front of my car, so something akin to a 1.14 bar. I ran a 60 series tire upfront for a year with those springs and loved how it handled. Wasn't too harsh at all and really leveled the car out in turns. I wish I could have gone bigger, but FF only offers one style bar for the F/J/M cars. If it were me, keeping the 60 series tires, 1.18 all day.