Rear Torsion Arm Left Side Billet 4130 Steel

The Rear Torsion Arm Left Side Billet 4130 Steel from Ti22 PERFORMANCE is designed for serious suspension builders and off-road enthusiasts who require precision geometry and durability in their independent rear suspension systems. This left-side torsion arm is a vital control arm in IRS (independent rear suspension) setups, managing wheel articulation and maintaining chassis geometry under extreme loads and cornering forces.

Manufactured from billet 4130 chromoly steel, this torsion arm combines an exceptional strength-to-weight ratio with superior fatigue resistance—essential for suspension arms that endure constant cyclical loading. The 4130 alloy offers approximately 20% more tensile strength than mild steel while remaining ductile enough to absorb impact energy without catastrophic failure, distinguishing it from cast alternatives that may break suddenly. The billet (CNC machined) construction process ensures a uniform grain structure and eliminates casting defects, resulting in consistent mechanical properties throughout the component.

This left-side torsion arm is ideal for high-performance street machines, competition off-road buggies, and custom fabrication projects, ensuring repeatable handling characteristics and compliance with modern suspension tuning standards. Its design is crucial for maintaining tire contact patch and vehicle stability during high-stress suspension articulation, making it a valuable addition for any serious automotive enthusiast.