Also curious...what is your motivation for changing what's there, settings-wise? Is the kart not doing something you'd like it to? Somewhere around early 2000's kart tuning theory changed, as did geometry. Now a wide scrub radius is used, and caster/camber not played with as much, from what I can see at events... The whole front is also wider on modern karts. Pre-2000s, track width was varied to achieve balance, now I see a lot more tuning at the rear and leaving the front in a narrower window... This may also have to do with the built-in ackerman columns too... Just wondering what you're trying to do by reducing caster?