Swift Springs Sport Lowering Springs, part of the Swift Springs lineup, for the 2018+ Lexus LS500 (XF50) are designed at the upper limits of OEM shock valving. These springs lower the center of gravity, reduce body roll, and sharpen handling response while remaining comfortable enough for daily driving. Both Sport and Spec-R options are excellent for street use, offering a ride that is slightly stiffer than factory suspension for a more controlled, sporty feel.

Developed for track duty and proven in HPDE and SCCA competition, Swift Springs Sport Springs were engineered with three critical traits in mind: optimized ride height to maximize suspension geometry, increased spring rates tuned to usable shock stroke, and retention of streetable comfort. Using proprietary H5S.TW material and a unique manufacturing process, Swift achieves a rare combination of comfort and performance where most competitors compromise. Fewer coils reduce unsprung mass and eliminate coil bind, while quicker transient response improves traction and road feedback. Swift also focuses on bump rubber design and vehicle-specific tuning—ensuring luxury cars keep a luxury ride and sports cars retain their sharp, sporty character.

Features

• Balanced handling with daily drivability
• Lowered stance with sporty ride quality
• Proprietary H5S.TW material for comfort and performance
• Lightweight coil design reduces unsprung mass
• Quicker transient response for improved traction
• Vehicle-specific tuning for luxury and sports applications
• Compatible with OEM-style or aftermarket shocks

Specifications

Part Number	4T923
Part Name	Swift Spec-R Lowering Springs
Vehicle	2018+ Lexus LS500
Chassis Code	XF50
Spring Rate – Front	643 Kg/mm
Spring Rate – Rear
Approximate Drop – Front	1.2"
Approximate Drop – Rear	1.2"
Quantity	4 Springs
Notes

Vehicle Fitment

• 2018 Lexus LS500 (XF50)
• 2019 Lexus LS500 (XF50)
• 2020 Lexus LS500 (XF50)
• 2021 Lexus LS500 (XF50)
• 2022 Lexus LS500 (XF50)
• 2023 Lexus LS500 (XF50)
• 2024 Lexus LS500 (XF50)