Kryptonite Radius Arm Kit - 2005-2026 Ford Super Duty F-250 thru F-550
Part # KRFDRD1
Kryptonite’s Heavy-Duty Radius Arms are designed to replace the factory arms with a stronger, more capable solution built for lifted trucks, larger tires, and real-world use.
Constructed from A36 steel and fully boxed with internal gusseting, these radius arms deliver the strength and rigidity needed to handle increased suspension loads from towing, hauling, and off-road driving. Compared to factory components, this design significantly reduces flex and improves overall front-end stability.
Equipped with Kryptonite’s multi-position hex caster adjustment system, these arms allow you to fine-tune alignment with selectable +2°, +4°, and +6° settings. This added adjustability is critical for maintaining proper steering geometry, improving return-to-center, and eliminating the wandering commonly found on lifted Super Duty trucks.
The offset design provides additional clearance for wider wheel and tire combinations, giving you more flexibility when building your truck without sacrificing strength or reliability.
Finished in a durable black powder coat and paired with high-strength Grade 10.9 hardware, these radius arms are built for long-term performance in demanding conditions.
If you’re looking to properly correct suspension geometry and upgrade beyond the limitations of factory components, Kryptonite Radius Arms deliver the strength, adjustability, and control your truck needs.
Includes:
- 2 x Fabricated Radius Arms (Left & Right)
- 4 x Hex Caster Adjusters
- 4 x Radius Arm to Axle Bolts & Nuts
- 2 x Adjustable Headlight Linkage Mounts
Features:
- Fully Boxed Radius Arm Design – Eliminates flex found in factory arms for improved strength and stability
- A36 Steel Construction – Built to handle heavy loads, towing, and off-road abuse
- Internal Gusset Reinforcement – Added strength in high-stress areas for long-term durability
- Multi-Position Caster Adjustment (+2°, +4°, +6°) – Dial in proper alignment and improve steering return-to-center
- Improved Steering Stability – Reduces wandering and enhances overall control, especially on lifted trucks
- Offset Design for Tire Clearance – Allows fitment of wider wheel and tire combinations
- Vulcanized Rubber Bushings – Designed for extended service life while reducing noise, vibration, and harshness
- Durable Black Powder Coat Finish – Corrosion-resistant for long-term use in harsh conditions
- Grade 10.9 Hardware Included – High-strength mounting hardware for secure installation
- Direct Bolt-On Installation – No cutting or fabrication required
