The two angles that define your tire's contact patch. Master these and you master grip.
Negative camber keeps the tire flat during cornering roll. Too much loses straight-line grip.
Camber is the tire's angle when viewed from the front. Negative = top leans in, positive = top leans out. Touring cars ALWAYS run negative camber.
As the car corners, weight transfers OUT. The tire rolls on its sidewall. Negative camber compensates — it keeps the tire FLAT on the ground during the corner, maximizing contact patch.
Typical values:
Front: -1.5° to -2.5° · Rear: -1.0° to -2.0°
More front camber = more initial bite (but less straight-line grip). Less rear camber = more stability on power.
The camber you SET at the workbench is NOT the camber in the corner.
As suspension compresses, camber changes (more negative). This is called camber gain — we cover it in Module 5. What you measure statically is just the starting point.
Toe controls how eagerly the car wants to turn. It also creates drag — the #1 tire wear factor.
Toe is the angle viewed from the top. Toe-out = front of tires point outward (car wants to steer out). Toe-in = front of tires point inward (car wants to go straight).
Front toe (almost always toe-out):
0.5° – 2.0° toe-out on front = sharper turn-in, more responsive. Too much = nervous on straights.
Rear toe (almost always toe-in):
2.0° – 3.5° toe-in on rear = stable under power, predictable exit. Too much = massive drag, hot motor.
Toe creates rolling resistance. Every 0.5° of toe (front out or rear in) = ~1-2°F motor temp at a normal track session.
That means you may need to adjust your FDR after changing toe to keep the motor in its sweet spot.
Tire sidewall measurements lie. Hub measurements are repeatable. Here's why.
Tires have molding lines, sidewall bulges, and wear patterns that make them unreliable for precision measurement. The hub face — the flat machined surface where the wheel bolts on — is the truth.
For CAMBER: measure angle at the hub face, not the tire. A 0.3° difference can be the difference between 'good' and 'great'.
For TOE: measure at hub height (center of wheel axis), not the tire top or bottom.
For toe, you can use digital calipers: measure front-of-tire distance and rear-of-tire distance (at hub height). Difference in mm = toe in mm. Convert to degrees using tire diameter.
These aren't independent. Changing one affects the other's effectiveness.
Interaction 1: Toe-out induces dynamic camber in corners.
When you steer, the wheel arcs through its steering range. As it turns, the tire picks up additional camber (becomes more negative on the outside wheel). Toe-out amplifies this effect.
Interaction 2: Ride height changes BOTH camber and toe.
Lowering the car changes the arm geometry — camber shifts, and if there's any bump-steer, toe shifts too. This is why you must RE-SET camber/toe after ride height changes.
Always think CAUSALLY: which physical effect needs to change? Then pick the adjustment that creates that effect. Don't just blindly try all options — diagnose first.