Kryptonite Radius Arm Kit for 2005-2026 Ford Super Duty F-250/F-350/F-450/F-550

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.

Instructions

CLICK HERE FOR INSTALLATION INSTRUCTIONS
You can find our recommended alignment specs HERE.

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

Warranty

(Kryptonite No Fine Print Lifetime Warranty)
Kryptonite Steering & Suspension components are warrantied for life to their original purchaser. This warranty covers manufacturer defects, premature wear, or breakage. Race it, jump it, off‑road it, wreck it, lift it—we don’t care. If you can break it, we’ll replace it.

Your Kryptonite products must be purchased through an Authorized Dealer, and Warranty Registration completed within 90 days of purchase. Complete warranty details can be found

Important Fitment Details

SOLD AS A PAIR