F1 Spanish Grand Prix 2026 Upgrades: Mercedes Builds for Madrid While Red Bull Chases a Monza Problem

The F1 Spanish Grand Prix 2026 upgrades list published by the FIA shows six teams bringing declared changes to Madrid’s Madring circuit debut weekend, with Mercedes filing the largest package of the six. Two of Mercedes’ three items are built specifically around Madrid’s lift-to-drag requirement, a circuit-specific tuning job rather than a blanket performance claim. Red Bull file both of their changes under Reliability, continuing work that started at Monza on the rear wheel bodywork and the floor bib. Cadillac add a revised rear-wing flap winglet and a new outboard diffuser vane. Ferrari reprofile a rear suspension fairing, McLaren add rear-wing furniture aimed at flow reaching the mainplane, and Alpine update the forward floor board. Aston Martin, Haas, Racing Bulls, Williams and Audi bring nothing declared this weekend.

Key Points: F1 Spanish Grand Prix 2026 Upgrades

• Six teams file declared car upgrades for the Spanish Grand Prix, F1’s Madrid debut weekend: Mercedes, Red Bull, Cadillac, Ferrari, McLaren and Alpine
• Mercedes bring the largest package, three items, two built specifically for Madrid’s drag range plus a front-drum flow change
• Red Bull file both changes under Reliability, continuing rear wheel bodywork and floor bib work carried over from Monza
• Cadillac add a revised rear-wing flap winglet and a new outboard diffuser vane, both targeting rear load
• Ferrari reprofile the rear suspension fairing, McLaren add rear-wing furniture, Alpine update the forward floor board
• Aston Martin, Haas, Racing Bulls, Williams and Audi bring no declared updates this weekend

Mercedes-AMG PETRONAS F1 Team

The current constructor leaders have brought three items, more than any other team this weekend, and two of them built for one specific job: getting Madrid’s lift-to-drag ratio right.

The rear wing is the main downforce-producing surface at the back of the car, while the smaller elements around it, winglets, endplates, trailing-edge pieces, fine-tune the balance between load and drag. Two of Mercedes’ three items belong to that family, even though only one sits on the wing itself.

The central winglet on the rear wing loses span. Smaller winglet, less local load, less drag, both effects at the same time. Mercedes describe it as shedding downforce and drag at a ratio appropriate for Madrid rather than chasing maximum rear load. The second item does the same job from an unlikely spot: an additional winglet behind the exhaust. The exhaust exit is tightly boxed in by the regulations, but the bodywork around it is still just bodywork sitting in moving air, and teams use it as flow-control real estate whenever the rules allow. Turning local flow through that area hits the same drag-range target as the wing change, from a completely different surface.

The third item sits apart. The “drum” is the bodywork wrapped around the front brake and wheel hub, and it sits in one of the most disturbed patches of air anywhere on the car, a spinning tyre, steering movement and the brake assembly all disturbing the airflow in the same area. Mercedes have reprofiled the front lip of it to keep airflow attached through all steering angles. Their own wording is about flow delivered toward the rear of the car, not a specific corner weakness or handling trait. Worth remembering the front corner passes on whatever flow it produces. The floor and the rear bodywork inherit it, clean or dirty.

Oracle Red Bull Racing

Reliability again. Both of Red Bull’s changes this weekend carry that classification rather than Performance, and it tells you exactly where their focus sits right now.

The rear wheel bodywork on a modern F1 car is a sealed covering around the wheel and upright, brought in by regulation specifically to cut the turbulent wake a spinning tyre throws off. Teams are allowed small winglets on that bodywork too, and that’s what’s changed here: a more robust gaiter arrangement, now carrying winglets downstream of the suspension fairings. Continuing work from Monza is Red Bull’s own framing. The stated aim is to restore load the earlier specification produced while keeping the wheel bodywork sealed. It’s a mechanically brutal place to hold an aerodynamic shape: tight against the tyre, close to the suspension, in some of the most disturbed air on the car.

Front-most edge of the floor: that’s the “bib”, the forward interface between the chassis and the underfloor, which forms part of the floor structure responsible for a large share of the car’s aerodynamic load. It flexes under load at speed, and that flexing creates strain in the structure beneath it. Red Bull’s floor bib gets a geometry and laminate change filed under the same Reliability heading: when the bib flexes, the current shape and laminate are apparently degrading the structure and the aerodynamic surface with it. The new version is built to reduce that local strain and protect the structure and aerodynamic surface from further degradation.

Same classification twice over, same underlying story. Red Bull aren’t bringing anything classified as a Performance update at Madrid. They’re trying to stop parts of the aero structure degrading.

Cadillac

Both Cadillac changes land at the same end of the car, and both carry the same classification: Performance, Local Load.

The rear wing flap gets a revised central trailing-edge winglet, reintroduced rather than new. As with Mercedes above, this is the standard family of small elements teams use to shape how the main wing surface performs. Cadillac say it generates more rear aerodynamic load while improving aerodynamic stability across a range of operating conditions, meaning consistency of the aero response as the car moves through different states, not a claim about how the car feels to drive. Cadillac haven’t made that connection, so neither will this piece.

Furthest back on the floor is the diffuser, the upswept section where air that has travelled underneath the whole car exits and expands, and it’s one of the biggest single contributors to a ground-effect car’s total downforce. A small vertical turning vane has gone into the inner trailing edge of the outboard sidewall, the outer edge of the diffuser nearest the rear tyre, aimed at the outer floor channels. Cadillac’s language ties it directly to rear load: control the flow leaving those channels and generate more rear load from it.

Scuderia Ferrari HP

Ferrari’s only change this weekend sits on the rear suspension fairing, specifically the rearward leg of the rear top wishbone, which gets reprofiled.

Suspension arms are structural, but the regulations allow teams to fit fairings, aerodynamic covers, around parts of them, and those fairings work as extra small aero surfaces even though the link underneath is just holding the wheel in place. The wishbone itself is unchanged here. What’s altered is the fairing around it, the permitted bodywork sitting in the airflow alongside the link. The new profile, according to Ferrari, changes the fairing’s incidence and spanwise loading distribution, returning a local load benefit. Small part, small change, and a fairing Ferrari have worked on before under this same broad description. That history says this is an established development area for them, nothing more specific than that.

McLaren Mastercard F1 Team

McLaren’s single declared change lands on the rear wing: additional elements the team call rear wing furniture.

“Furniture” is paddock shorthand for small bolt-on aero pieces near a bigger surface that don’t generate much load themselves, they condition the air before it gets to the part that does. The extra elements, McLaren say, improve the flow conditions reaching the rear wing mainplane and flap. That’s flow conditioning, not a direct load claim. Small winglets ahead of a bigger surface, shaping what arrives at it rather than generating load themselves. McLaren haven’t said whether the target is more peak load, better consistency, or efficiency, so there’s no point pretending we know which of those they’re targeting.

BWT Alpine F1 Team

Alpine’s lone change this weekend sits at the front of the car: an element added to the forward floor board.

The floor is the largest single downforce-generating surface on a modern ground-effect F1 car, bigger than the front or rear wing on its own, and the forward section sets up the pressure field that the rest of the underfloor and the diffuser then work with. That makes the forward floor an important area for controlling the airflow the rest of the underfloor receives, even when the change itself is small. Alpine say the optimisation improves local pressure distribution and flow management, generating efficient local downforce. Alpine’s own wording keeps the claim local though: pressure distribution and flow management at the front of the floor, nothing wider than that.

The Five With Nothing Declared

Aston Martin, Haas, Racing Bulls, Williams and Audi have no newly declared updates for Madrid. That doesn’t necessarily mean they’ll run exactly the specification they left Monza on, because teams can still use parts and configurations introduced earlier in the season.

No update declared doesn’t mean no development happening behind it. There are plenty of reasons not to bring a new part to a particular weekend, from development timing and production schedules to a larger package being planned for another circuit.

Coffee Corner Take

Two real stories here: one chasing reliability, one chasing performance. Both show you exactly where these two teams are right now.

Both of Red Bull’s changes carry that same reliability classification. Structural strain at the floor bib. Rear wheel bodywork still being revised after the work that started at Monza. The load Red Bull are chasing already existed on the car before something started degrading it. Recovery work, not development work. It shows where Red Bull are right now, and it feels like a team still trying to get to grips with its own car and understand it, rather than one extracting performance from it.

Mercedes sit at the other end of it: a car that has looked solid at every track so far in 2026. Filing the biggest package here, and building two of three items purely around Madrid’s drag requirement, says something too. A team confident enough in the base car to spend development time on configuration rather than raw load. Circuit-specific tuning is what teams do when the fundamentals aren’t in question. Worth watching whether that approach shows up again at the next low-drag circuit, or whether Madrid was a one-off.

Five teams brought nothing declared. That doesn’t automatically mean bad news for any of them, upgrade timing varies for good reasons. The issue for the rest of the grid is that Mercedes are the ones on top and still developing what already looks like a strong car, which means the gap to the front could just keep growing.