F1 suspension, explained: pushrods, torsion bars and ride height
It looks like plumbing hidden behind carbon fibre, but F1 suspension is the mechanical system holding the aerodynamic platform together, and in the ground-effect era it decides whether the floor works at all.
By Indy GillWatch the onboard replay from a hot lap in the ground-effect era and somewhere down the straight the car starts to shudder, a rapid vertical judder that looks like something has come loose. Nothing has. That's suspension, ride height and the floor arguing with each other at 300 km/h, and for the first couple of seasons after 2022 that argument decided who won on Sunday.
What's actually under the bodywork
Strip the carbon fibre away and an F1 car uses double-wishbone geometry at each corner, the same basic layout as touring cars and plenty of road cars, but everything that makes it interesting is hidden inboard. Modern F1 cars pair that double-wishbone layout with pushrod or pullrod actuation, torsion-bar springs and bodywork so tightly integrated with the aerodynamics that you can barely tell where suspension ends and floor begins. The wishbones locate the wheel; the pushrod or pullrod carries the vertical load away from the wheel and into the chassis, where the actual springing and damping happens, out of the airstream and out of sight.
That inboard packaging isn't an accident. Active suspension, the fully electronic ride-height control that Williams ran in the early 1990s, has been outlawed for three decades, so every element on today's car has to do its job without a computer adjusting it mid-corner. Everything a team wants the car to do at 300 km/h has to be built into springs, rockers and dampers before the car ever leaves the garage.
Pushrod or pullrod: the same job, two different routes
The distinction sounds like trivia until you see it on the car. Think of the rod as a lever that transmits wheel movement to the spring inboard, and the difference is simply which way that lever works: over a bump, a pullrod is loaded in tension and effectively pulls the mechanism outward, while a pushrod is loaded in compression and shoves it inward. That single geometric difference cascades into how a team packages the whole front or rear end. A pullrod setup tends to run low through the chassis, with a diagonal rod dropping down from a high point on the upright to a spring and damper mounted near the floor. That matters because it moves weight downward. Get the heavy hardware, springs, dampers, rockers, sitting low in the car rather than up near the top wishbone, and the whole chassis carries its mass closer to the ground. A lower centre of gravity suits a ground-effect car particularly well, since the floor's performance depends on the car staying settled and planted.
Neither layout is simply better. It's a trade against the rest of the car: nose height, sidepod shape, the airflow a team wants feeding the floor. Front pullrod, rear pushrod has become the common split on current grids, but you'll still find variation between garages because the suspension has to serve the aero concept, not the other way around.
Torsion bars, heave elements and why engineers talk about "decoupling"
Inside the chassis, the spring isn't a coil, it's a torsion bar, a length of metal rod doing the job a coil spring does on a road car. Twist it and it resists, then unwinds back to shape, and that resistance to twisting is what absorbs the wheel's vertical movement. A rocker converts the pushrod or pullrod's linear motion into that twisting force, and a separate damper at each corner governs how quickly the wheel is allowed to rise and fall.
The complication is that a single spring and damper per wheel can't separate the different ways a car moves. Push down on one corner and, through the geometry, you change how every other corner behaves; load up the right rear and the left front's behaviour shifts too, whether the engineers wanted it to or not. So teams add a third element, sometimes called a heave spring or heave damper, that links the two wheels on an axle. When both wheels compress together under braking or through a fast straight, this shared spring is what governs how far the car pitches down and how it recovers, and teams often pair it with an inerter, a device that resists the rate of the tyre's own vertical bounce rather than just its position, to keep the whole assembly settled.
Why bother with the extra hardware? Because it buys engineers a kind of independence they wouldn't otherwise have. A separate heave element lets a team dial in how the car pitches and settles largely on its own terms, without that setting fighting the roll stiffness or the wheel-to-wheel response the rest of the suspension is handling. A car can be stiff enough in heave to survive a straight-line load spike without needing to be equally stiff over kerbs and bumps, which is exactly the compromise wing-only cars never had to solve so precisely.
Why ride height became the whole story after 2022
This is where suspension setup stopped being a chassis engineer's private concern and became a headline topic for anyone watching the sport. Ground-effect floors generate downforce through low-pressure air accelerating under the car, and that effect is savage about distance from the ground. Nudge the ride height by a few millimetres and the downforce swing isn't gentle, it's dramatic; run the floor too close to the tarmac and the airflow underneath can stall outright, dumping downforce in an instant. A wing doesn't behave anything like that. A wing keeps generating roughly the amount of downforce you'd expect across a wide range of ride heights, only misbehaving at genuinely extreme angles, so getting suspension setup slightly wrong used to be forgiving. Under a ground-effect floor it isn't.
Run the car low enough to unlock maximum downforce and you get porpoising, one of the defining problems of this regulation era. Picture the sequence: the floor sucks the car down as speed builds, the underfloor airflow chokes and stalls once the gap gets too tight, downforce vanishes, the car springs back up on its suspension, the airflow reattaches, and the whole cycle starts again a heartbeat later, all the way down the straight. The uncomfortable part for engineers is that the two obvious fixes fight each other. Stiffen the suspension and the car holds a more consistent ride height, which is what the floor wants, but a stiffer car can't absorb the vertical movement as smoothly, so once the bouncing starts, a stiff setup tends to amplify it rather than calm it down. Soften the springs to calm the bouncing and the ride height wanders more through braking and cornering, costing the very downforce the low ride height was chasing in the first place.
Most teams landed on a blunter answer. Running the car slightly higher costs some peak downforce, but it keeps the floor further from that stall point and cuts the aerodynamic oscillations down substantially. It's not glamorous, but it's the compromise every team on the grid has had to find since 2022, and the teams that found it fastest built a real competitive edge out of a problem that, on paper, was just a suspension setting.
Where you'll actually spot it
You won't see the torsion bars or the heave element on a broadcast, but you'll hear the commentary reach for the concept. A driver complaining the car is "bottoming out" on a bumpy circuit, an engineer talking about running the car "a click higher" for Sunday, a team that looks planted through fast corners while a rival bounces on the straight, all of that traces back to the springs, dampers and rods discussed here. It's also worth remembering the setup is frozen the moment it matters most: once qualifying gets underway, parc fermé rules lock the mechanical configuration, so whatever a team dialled in before Q1 is what they're racing with on Sunday.
The next time a car looks unsettled over kerbs at one circuit and rock steady at the next, that's suspension setup doing exactly what it's built to do, or occasionally failing to. Watch how a team's ride height choice at a bumpy track compares to how they run at a smooth one; the pattern tells you more about their aero platform than any single lap time will.