Anti-Dive Calculator

Press the brake pedal and your car's nose dips forward. That is brake dive, and it happens because deceleration throws weight onto the front wheels and compresses the front springs. Anti-dive geometry pushes back: angle the front suspension links the right way, and the braking forces themselves lift on the chassis instead of letting it pitch. This calculator tells you what share of that forward weight transfer your geometry cancels. Give it the suspension link angle, the braking force distance, and the center of gravity height, and you get the anti-dive percentage.

Why brake dive matters

Left alone, the dive does more than feel unsettling. As the front squats and the rear lifts, the headlight beams point skyward, the rear tires go light, and the car's balance shifts right when you want it steady. None of that helps you stop in a straight line.

The fix is geometric. Tilt the front control arms so braking loads create an upward pull at the chassis mounts, and you trade some of the pitch for a push back up. The result gets quoted as a percentage: 0% means the geometry ignores dive entirely, and 100% would cancel all of it on paper. Most road cars land somewhere between 15% and 50%. Race cars wander outside that range depending on the track and how the driver likes the car to feel.

How to use this calculator

You will need three measurements off the car:

Suspension Link Angle. The angle the front control arms make with horizontal, seen from the side of the car.
Braking Force Distance. The horizontal distance from the tire contact patch to where the braking force line crosses the vertical plane through the suspension pivot.
Center of Gravity Height. How high the car's center of gravity sits above the ground.

Fill in any three and the fourth fills itself in. Each field has a unit dropdown if you want to switch between metric and imperial.

Understanding the formula

The percentage comes from one equation:

AD = \left( \frac{\tan(\theta) \times d}{h} \right) \times 100

Read it left to right. The tangent of the link angle is the slope of the control arms. Multiply by the braking force distance and you have the upward push the geometry makes. Divide by the CG height to weigh that push against how hard the car wants to pitch forward, then multiply by 100 to land on a percentage.

Run it on a real car. Say a CG height of 0.5 meters, a suspension link angle of 10 degrees, and a braking force distance of 0.3 meters. Start with the tangent: $\tan(10^\circ) \approx 0.1763$ . Multiply by the distance: $0.1763 \times 0.3 = 0.0529$ . Divide by the CG height: $\frac{0.0529}{0.5} = 0.1058$ . Finally, multiply by 100: $0.1058 \times 100 = 10.58\%$ . This geometry counteracts about 10.6% of the braking-induced weight transfer.

Where anti-dive matters

The same number gets used in a few different garages. A factory chassis engineer leans on it to trade braking stability against ride comfort on a new platform. A race team dials it in track by track, running more anti-dive where there are heavy braking zones and backing off where the surface is rough enough that the car needs to soak up bumps. And anyone relocating control arm mounts on their own build can check, before they cut anything, how the change will move the car's braking behavior.

Tuning tips

Most road cars sit around 15-30%, which keeps the nose settled under braking without beating you up over bumps.
Values above 50% can cause jacking, a harsh locked feeling during braking that reduces tire grip.
Moving the mounts to change anti-dive also drags camber gain, bump steer, and scrub radius along with it, so check those before you commit to a new geometry.
Lower CG vehicles need less aggressive link angles to achieve the same anti-dive percentage.

Frequently asked questions

What is a good anti-dive percentage?

Most production vehicles use 15-50%. Racing applications vary by discipline, but 20-40% is common for circuit racing. Off-road vehicles may use lower values to maintain wheel travel.

Can anti-dive be too high?

It can. Once you get near or past 100%, the suspension starts jacking, so the front end feels like it lifts under braking instead of settling. That lightens the contact patch and costs you braking grip, which is the opposite of what you were after.

Does anti-dive affect ride comfort?

Higher anti-dive values transmit more braking forces through the chassis rather than the springs. Some drivers perceive this as harshness during braking over bumps.

How do I measure the suspension link angle?

Project the control arm pivot points onto a side view of the car. The angle between the line joining those points and the horizontal ground plane is your suspension link angle. A digital inclinometer works if you are measuring on the car; CAD does the job if you are still on the drawing board.