Tesla Replaces Cybertruck Aluminum Underbody Panels With Carbon Fiber Composite Trays

Updated on August 05, 2026 • 4 min read

Tesla has introduced a new carbon fiber composite underbody tray for the Cybertruck, replacing the stamped aluminum panels used in earlier production vehicles. The update is part of Tesla’s ongoing manufacturing improvements aimed at increasing durability, reducing weight and improving vehicle efficiency without waiting for a traditional model-year refresh.

The hardware change was first identified by automotive content creator Coleton Guerin (Out of Spec) while detailing a newly delivered CyberBeast. Images shared online showed both the front and rear motor areas fitted with molded composite trays instead of aluminum panels.

Tesla’s Lead Cybertruck Engineer Wes Morrill later confirmed the production change, explaining that testing demonstrated the composite material offered advantages in durability, manufacturing and aerodynamic performance.

Composite Material Offers Multiple Engineering Benefits

According to Tesla, the new composite trays were selected because they are:

• More durable than stamped aluminum
• Lower in weight
• Lower in manufacturing cost
• Better suited to aerodynamic shaping

Unlike stamped aluminum, molded composite components can incorporate more complex geometries around fasteners and structural mounting points.

Tesla says these smoother surfaces help maintain cleaner airflow beneath the vehicle, providing a modest improvement in aerodynamic efficiency.

The composite design also improves resistance to road debris and off-road impacts while avoiding unnecessary weight increases.

Manufacturing Improvements Continue During Production

Tesla has frequently introduced engineering updates directly into ongoing vehicle production rather than waiting for annual redesigns.

Once new components complete internal validation and supplier readiness, they are incorporated into the production line.

This approach allows manufacturing improvements to reach customers more quickly while simplifying future production.

The carbon fiber underbody trays represent another example of Tesla refining existing vehicle designs through incremental engineering changes.

Lightweight Composites Continue Expanding in Automotive Applications

Professor’s Analysis

Although Tesla described the new component as a carbon fiber composite tray, the announcement did not disclose the specific composite architecture, resin system or manufacturing process.

That distinction is important because automotive carbon fiber components can be produced using several technologies, including:

• Compression molding
• Sheet molding compounds (SMC)
• Resin transfer molding (RTM)
• Injection-molded carbon fiber reinforced thermoplastics

Without additional technical information from Tesla, it would be premature to identify the exact manufacturing method.

From an engineering perspective, however, the decision reflects a broader industry trend.

Composite materials are increasingly replacing metallic underbody components where engineers seek to combine:

• Weight reduction
• Impact resistance
• Corrosion resistance
• Greater design freedom

Unlike stamped metal, composite molding allows engineers to create integrated shapes that improve airflow while reducing the number of secondary manufacturing operations.

Composite Adoption Continues Beyond Structural Panels

The Cybertruck already incorporates stainless steel exterior panels, aluminum structural components and numerous composite parts throughout the vehicle.

Adding composite underbody protection further demonstrates how automakers are applying advanced materials to optimize individual vehicle systems rather than replacing entire body structures.

As electric vehicles place greater emphasis on efficiency and range, lightweight composite components are expected to become increasingly common in areas such as battery protection, aerodynamic panels, structural reinforcements and thermal management systems.

Small Changes Can Deliver Long-Term Manufacturing Benefits

While the underbody tray update may appear relatively minor, it illustrates how manufacturers continue improving production vehicles through incremental material and process changes.

For automotive composites, the value often lies not only in reducing weight, but also in enabling improved manufacturability, lower production costs and more efficient component design.

Tesla’s latest production update highlights how composite materials continue expanding into practical, high-volume automotive applications beyond traditional body panels and performance vehicles.

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This article is developed based on real engineering experience, machine testing data, and practical production knowledge from Jota Machinery’s work in advanced composite manufacturing.

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