Chassis & Bodywork
The chassis and bodywork regulations define the structural and aerodynamic framework of the 2026 Formula 1 car, with significant changes aimed at reducing size, weight, and improving racing.2026 Chassis Changes
The 2026 regulations introduce smaller, more agile cars:
- Weight reduction: 30kg lighter (minimum weight 768kg)
- Shorter wheelbase: Reduced by 200mm
- Narrower track: Front and rear track reduced by 100mm
- Smaller overall footprint: Improved maneuverability
Overall Dimensions
Maximum Dimensions
| Dimension | Limit | Notes |
|---|---|---|
| Overall length | 5,000mm | Excluding camera housings |
| Overall width | 1,900mm | At widest point |
| Wheelbase | 3,400mm max | Reduced from 3,600mm |
| Front track | 1,600mm | Reduced by 50mm |
| Rear track | 1,520mm | Reduced by 50mm |
| Overall height | 950mm | From reference plane |
Weight Requirements
Minimum Weights (2026)
Car Minimum Weight
768kg - Including driver and seat, excluding fuel
Driver + Seat Weight
80kg - Standardized driver weight for competitive equality
If a driver weighs less than 80kg (including race suit and helmet), ballast must be added to the survival cell to reach the standard weight.
Survival Cell (Monocoque)
The survival cell is the central safety structure housing the driver.Construction Requirements
Material Specification
Carbon fiber composite construction with minimum specifications:
- Minimum skin thickness: 3.5mm
- Minimum sandwich thickness: 10mm
- Honeycomb core density: minimum 80kg/m³
Structural Integrity
Must pass all FIA crash tests including:
- Front impact test
- Side impact tests (upper and lower)
- Rear impact test
- Rollover test
Cockpit Opening
Cockpit Entry Template
Cockpit Entry Template
The cockpit opening must allow the driver to enter/exit within specific time limits:
- Driver must be able to exit within 5 seconds
- Must accommodate the FIA standard cockpit template
- Minimum dimensions: 520mm x 420mm (width x height)
- Steering wheel must be removable for egress
Aerodynamic Regulations
Active Aerodynamics (New for 2026)
Front Wing
Active front wing elements to reduce understeer in corners and drag on straights
Rear Wing
Active rear wing adjustment for DRS and balance optimization
Active Aero Modes:
- Z-Mode: Maximum downforce configuration for corners
- X-Mode: Low drag configuration for straights (activated by driver)
- Transitions controlled by FIA-spec electronic systems
Front Wing
Specifications:- Maximum width: 1,600mm
- Maximum height: 300mm from reference plane
- Active elements: 2 adjustable flaps
- Material: Carbon fiber composite
- Must pass deflection tests (maximum deflection under load)
Rear Wing
Specifications:- Maximum width: 1,000mm
- Maximum height: 950mm from reference plane
- Active elements: Main plane and flap adjustable
- DRS activation: Via FIA control system
- Beam wing: Permitted with dimensional restrictions
Floor and Diffuser
Floor Specifications
Floor Specifications
Underfloor Aerodynamics:
- Flat floor with defined edge wings
- Diffuser maximum height: 330mm
- Strict volume regulations using FIA reference planes
- Porpoising control: Minimum floor stiffness requirements
- Edge wing geometry: Defined by mathematical surfaces
Bodywork Zones
Bodywork is divided into regulated zones:| Zone | Description | Key Restrictions |
|---|---|---|
| Zone 1 | Front wing area | Active aero permitted, dimension limits |
| Zone 2 | Front wheels | Covered wheel fairings required |
| Zone 3 | Sidepods | Simplified geometry, cooling optimization |
| Zone 4 | Engine cover | Minimal cross-section, shark fin limited |
| Zone 5 | Rear wing | Active aero permitted, DRS functionality |
| Zone 6 | Floor | Strict planform and volume limits |
Wheel Fairings
New for 2026: Mandatory wheel fairings to reduce turbulence
- Front wheels: Full covers over upper 180° of wheel
- Rear wheels: Partial fairings
- Material: Carbon fiber or composite
- Must be fixed to suspension (not wheel)
Ground Effect and Ride Height
Ride Height Sensors
FIA Monitoring
Mandatory ride height sensors at 4 points: front left, front right, rear left, rear right
Suspension Systems
Suspension Type
Permitted:- Double wishbone suspension (front and rear)
- Passive spring and damper systems
- Mechanical anti-roll bars
- Active suspension systems
- Computer-controlled damping
- Hydraulically interconnected suspension
- Inerter devices with movable masses
Suspension Geometry
Geometry Constraints
Geometry Constraints
Pick-up Points:
- All suspension mounting points must be within defined volumes
- Changes to pick-up points require homologation
- Trackrod must be visible from above
- No active camber or toe adjustment
- Passive compliance permitted within limits
Wheels and Tires
Wheel Specifications
| Parameter | Front | Rear |
|---|---|---|
| Diameter | 18 inches | 18 inches |
| Width | 305mm | 380mm |
| Material | Forged aluminum alloy | Forged aluminum alloy |
| Weight | Minimum 9.0kg | Minimum 9.5kg |
All teams must use spec tires supplied by the single FIA-appointed tire manufacturer (Pirelli through 2028).
Tire Regulations
- Allocation: 13 sets per car per event weekend
- Compounds: 3 slick compounds per event (selected by FIA)
- Wet tires: Intermediate and full wet specifications
- Blankets: Tire warming permitted to maximum 70°C (front/rear)
Bodywork Flexibility Tests
Deflection Testing
The FIA conducts static load tests to ensure bodywork rigidity:Front Wing
150N load: Max 5mm deflection
Rear Wing
1000N load: Max 5mm deflection
Floor
2000N load: Max 5mm deflection
Ballast and Weight Distribution
Ballast Requirements
Weight Distribution
While there is no mandated weight distribution, the regulations impose constraints:
- Minimum 80kg driver weight standardization affects balance
- Ballast placement restricted to survival cell
- Component weight minima (power unit, wheels, etc.) limit optimization
Cooling Systems
Radiator Requirements
- Location: Sidepods and chassis sides
- Efficiency: Optimized for 2026 power unit heat rejection
- Geometry: Must fit within bodywork volumes
- Safety: No exposed radiator surfaces
Oil and Water Systems
Cooling Specifications
Cooling Specifications
Engine Cooling:
- Water radiators: Minimum capacity for ICE cooling
- Oil coolers: Engine and gearbox separate systems
- Air-to-air intercoolers: For turbocharged air cooling
- Battery cooling: Liquid cooling system required
- MGU-K cooling: Integrated with power unit cooling
- Electronics cooling: Air or liquid systems permitted
Mirrors and Vision
Mirror Specifications
- Quantity: 2 mandatory mirrors (left and right)
- Minimum area: 150cm² reflective surface per mirror
- Mounting: Must withstand vibration without adjustment
- Position: Provide clear rearward vision
Mirror housings may be used for minor aerodynamic benefit but primary function must be vision provision.
Cockpit and Driver Interface
Steering Wheel
- Diameter: No restriction
- Quick release: Mandatory quick-release mechanism
- Controls: All driver controls located on steering wheel
- Display: FIA-spec electronic display unit
Seat and Harness
Seat
Custom molded to driver, FIA-approved material, minimum thickness 10mm
Harness
6-point harness, FIA 8853/2016 standard, maximum 2-year age
Headrest and Cockpit Protection
Halo Device
The halo device remains mandatory:- Material: Titanium alloy (Grade 5)
- Load capacity: 125kN vertical load
- Weight: Approximately 7kg
- Mounting: 3-point attachment to chassis
- Vision: Minimal obstruction to driver sight lines
Prohibited Devices
Homologation Process
Chassis Homologation Timeline
Related Topics
Power Unit
Power unit specifications and integration with chassis
Safety
Crash testing requirements and safety systems
Electronics
Electronic systems integration and sensors