An interactive chassis diagnostic The wheel
alignment &
how cars track.

Your car has four wheels, but those wheels aren't just pointing straight ahead — they're set at very specific angles to make the car handle well, track straight, and wear tyres evenly. This tool lets you adjust those angles and see what happens.

The three angles that matter

Toe — are the wheels pointed slightly inward (toe-in) or outward (toe-out)? Measured in degrees off straight-ahead.

Camber — does the wheel tilt inward or outward at the top when you look at it from the front? Usually a bit of negative camber (top-in) for grip.

Caster — does the steering pivot axis lean forward or rearward? Positive caster (rearward lean) makes the steering self-center, like a shopping trolley wheel.

The three main outputs

1. Top-down view — see where each wheel is actually pointing, and where the car will travel (green arrow). The orange dashed line is the thrust line — the direction the rear wheels push the car.

2. Driver-Held Position — where the steering wheel needs to sit for the car to travel perfectly straight.

3. Hands-Off Rest Position — where the wheel would sit if the driver let go. For a perfectly aligned car, both are centered. For a misaligned car, the two differ — and the difference tells you how much the driver is fighting the car.

Try this to get started

Beginner vs Expert mode

Beginner (default) shows only the essentials. Expert exposes advanced readouts, the contribution breakdown, and coefficient tuning.

Inverse Diagnostic

Got a car that pulls or has a crooked wheel? Click the Inverse Diagnostic tab. Describe what you're seeing — and the tool ranks the most likely causes with how to confirm and fix each one.

Geometry terms

Toe — angle of wheel relative to straight-ahead, viewed from above. Toe-in means leading edges point toward the car centerline. Toe-out means outward.

Camber — tilt of the wheel from vertical, viewed from the front. Negative = top leans inward. Positive = top leans outward.

Caster — rearward tilt of the steering axis, viewed from the side. Positive caster creates self-centering torque and straight-line stability.

Thrust angle — angle between where the rear wheels are pointing and the car's geometric centerline. Non-zero causes dog-tracking.

Geometric centerline — an imaginary straight line down the middle of the car, lengthwise.

Thrust line — the direction the rear axle is actually pushing the car.

Behavior terms

Dog-tracking — car travels slightly sideways (like a dog whose hips are offset from its shoulders). Rear axle misalignment.

Pull — car consistently drifts to one side even on a flat road. Force-generating misalignments.

Camber thrust — sideways force a tyre generates because it's rolling while tilted.

Self-centering — the wheel's tendency to return to center when released. From caster and mechanical trail.

Measurement terms

Individual toe — the toe of one wheel measured alone.

Total toe — sum of individual toes on an axle.

Steering ratio — steering wheel degrees per degree of road-wheel turn. Lower = quicker.

Setback — one wheel further rearward than the other on the same axle.

Driver state terms

Driver-held position — where the wheel must sit for the car to drive straight.

Hands-off rest position — where the wheel would naturally sit if released.

Passively held — light bias; no continuous force. Usually kinematic.

Actively held — driver fights a constant force. Usually a force-driven misalignment.