What ARBs do
An anti-roll bar connects the left and right wheels on one axle. Stiff ARB = the two wheels move together = less body roll = sharper turn-in BUT less mechanical grip at that axle (because the inside wheel can't stay loaded independently).
The fundamental balance rule
The stiffer end loses grip first. Stiffer front = understeer. Stiffer rear = oversteer. This is the cheapest, fastest balance lever in the entire tune.
Recipes
- Understeer at every corner phase → soften front ARB 2-3 clicks OR stiffen rear ARB 2-3 clicks.
- Snap oversteer on entry → soften REAR ARB 2-3 clicks.
- FWD car that won't rotate → make rear ARB MUCH stiffer than front (e.g., 35/60 split). Lifts the inside rear → pivot point.
- Body roll feels seasick → stiffen BOTH ARBs by 2-3 clicks together. Keeps balance, removes roll.
A common mistake
Maxing both ARBs sounds like "more responsive." It's actually "twitchy and unforgiving." Race ARBs in FH are stiff enough that you can usually run them in the lower third of the range and still feel sharp.