BustaWrench › Answers › How do camber, caster and toe affect grip in iRacing?
The short answer
Camber is the tyre leaning in or out: negative camber buys cornering grip and costs straight-line bite and braking. Caster is what makes the wheel self-centre and adds feel and camber gain, at the price of heavier steering. Toe-out sharpens turn-in, toe-in adds stability, and a little rear toe-in keeps the back end calm. Change one number at a time, in 0.1° steps.
Negative camber tilts the top of the tyre in, so the contact patch sits flat when the body rolls. That is your cornering grip, and it comes out of your straight-line bite and braking.
Too much and you scrub speed down every straight. Too little and the outside tyre rolls onto its shoulder mid-corner and you lose the front. Start from the baseline and add 0.2–0.3° of negative camber if the front washes out — then watch your straight-line temps.
Caster is the steering axis angle seen from the side. More caster gives heavier, more communicative steering and better camber gain mid-corner; it also makes the wheel fight you at low speed and can upset the car over bumps. Less caster is lighter but vaguer.
Sort camber and toe before you chase caster. It is the fine-tune, not the foundation.
Toe-out at the front sharpens turn-in, because the inside tyre bites first. Toe-in adds stability, especially under braking, but dulls the initial response.
A little rear toe-in is your friend for keeping the back end calm. Rear toe-out will keep you busy.
Run a full stint on the default first and note where the car understeers, oversteers, or just feels dead. Then move one number in 0.1° steps and do back-to-back laps.
Alignment is a triangle, not a ladder. Move camber and expect toe to feel different.
Alignment numbers that work on one car and one track are not a universal recipe. If you are chasing a specific handling problem, ask a coach before spending a session on it.
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