Custom Chassis & Subframes for Automotive & Motorsports

Engineered chassis bracing, subframe structures, and suspension mounting solutions. Tolerances ±0.3–0.8 mm for mandrel bending; assembly ±0.5–1.0 mm confirmed at quote. DOM, chromoly, and aluminum available. From 10–14 business days; 48h DFM & quote; load testing available.

Upload Design — 48h Feasibility View Applications

Accepted Formats: STEP · IGES · DWG · SLDPRT · PDF

Custom Chassis & Subframe Design Engineering

Design-for-Manufacturing (DFM) Review

Every chassis and subframe begins with structural engineering precision. Our design and manufacturing teams work with OEMs, custom builders, and motorsports engineers to create structures that deliver optimal strength, minimal weight, and seamless integration.

We evaluate every design for load distribution, mounting compatibility, and manufacturing feasibility. Whether you need a complete subframe assembly or strategic chassis bracing, we optimize for performance, weight, and reliability.

Load path analysis for suspension mounting and chassis stiffness
Tube sizing and routing optimization for structural efficiency
Integration with existing chassis and mechanical systems
Weight optimization while maintaining strength requirements
Manufacturing feasibility and fixture design for repeatable production

Structural Analysis & Engineering

From concept to production, we provide comprehensive engineering support:

Load Analysis — Verify structural integrity for suspension and chassis loads
CAD Design & Optimization — Model geometry and refine for manufacturing and performance
DFM Review & Feasibility — 48h feedback on bending, welding, and assembly approach
Production & Testing — Controlled fabrication with dimensional verification and optional load testing

Precision Tube Fabrication for Chassis Structures

Each chassis and subframe is built using CNC mandrel bending, laser tube cutting, and controlled TIG/MIG welding. This ensures accurate curves, strong weld seams, and repeatable geometry essential for automotive and motorsports applications.

CNC Tube Bending

Mandrel bending for chassis bracing and suspension components. Tolerances ±0.3–0.8 mm depending on tube diameter, radius, and material properties.

TIG/MIG Welding

Controlled welding with visual inspection for structural integrity. Assembly tolerances ±0.5–1.0 mm confirmed at quote based on fixture design.

Laser Tube Cutting

Precision mounting holes, miters, and end cuts in single setup. Tolerances ±0.05–0.1 mm for feature positioning and dimensional accuracy.

Seamless Chassis Integration & Optimization

[Image Placeholder]
Custom Chassis Subframe Assembly

Integration with Existing Structures

We understand the complexity of integrating custom subframes and bracing into existing chassis structures. Our team evaluates mounting points, load distribution, and geometric compatibility to ensure reliable, repeatable installation and performance.

First Article Inspection (FAI) with full dimensional report
In-process bend and weld quality verification
Final assembly dimensional verification against drawing specs
Load testing available for critical suspension components
CMM inspection available for complex geometries

Every assembly is dimensionally verified and tested to ensure it meets performance requirements and integrates seamlessly with your vehicle platform.

Application Examples

From complete subframe assemblies to strategic chassis reinforcements, our fabrication delivers the structural strength and precision engineering required for high-performance automotive platforms.

Custom Subframe Structure

Engineered subframe assembly integrating suspension mounting points, steering linkage brackets, and integrated bracing. CNC-bent and TIG-welded for precise geometry and structural reliability.

Chassis Reinforcement Bracing

Strategic tube reinforcement systems reducing frame flex and improving chassis stiffness. Designed for seamless integration with existing structures while minimizing weight impact.

Suspension Mounting System

Fabricated mounting structures for coilovers, anti-roll bars, and suspension geometry optimization. Precision mounting holes and load-rated joints ensure reliable performance.

Why Partner with X-KPR

When chassis and subframe systems need engineering rigor and precision fabrication, X-KPR delivers proven quality systems, technical expertise, and streamlined coordination to bring your designs to life on schedule.

Engineering-Driven Design

Structural analysis, load distribution modeling, and chassis integration support. 48h DFM feedback accelerates your development timeline.

End-to-End Fabrication

Tube bending, laser cutting, TIG/MIG welding, and surface finishing all under one roof. Consistent quality and simplified coordination.

Precision & Repeatability

Fixture-based bending and welding ensures repeatable geometry across production runs. Perfect for motorsports and custom automotive applications.

Frequently Asked Questions

What materials are best for chassis and subframe fabrication?

We work with DOM (Drawn Over Mandrel) steel, chromoly, and aluminum alloys. Material selection is based on strength requirements, weight targets, and structural application. Our team provides recommendations at quote.

Can you design custom subframe structures from scratch?

Yes. Our engineering team supports full design and fabrication of custom subframes. We provide CAD modeling, load analysis, and DFM optimization to ensure manufacturability and performance.

What are your typical tolerances for chassis components?

Tube bending tolerances range ±0.3–0.8 mm; assembly tolerances are ±0.5–1.0 mm confirmed at quote. For complex geometries, we offer CMM inspection verification.

How do you ensure chassis geometry consistency across multiple units?

We use CNC-controlled bending and precision fixtures for welding. Every unit is verified dimensionally and compared to master samples for repeatable geometry.

Do you support integration with existing chassis structures?

Yes. Our team works with existing chassis geometries, evaluating mounting points, load distribution, and structural compatibility. Engineering review ensures seamless integration.

What lead times should I expect?

Typical lead time is 10–14 business days after design confirmation. Complex subframe assemblies may require 14–21 days depending on geometry and testing requirements.

Request a Quote — Upload Your Drawings

Tell us your material specifications, tube sizes, load requirements, and integration points. We'll return DFM feedback and a firm quote within 48 hours.

Upload Drawings & Get a Quote Contact Us