Sharper Stance for Your F Sport Without Sacrificing the Ride Quality You Paid For
The NX350h F Sport already sits low and planted, but RS-R’s Down Sus springs tighten that stance further while keeping the factory shocks fully in play. RSRT525D is a direct bolt-in front and rear coil spring set engineered specifically around the AWD NX350h hybrid platform, dropping the fender gap without the harsh secondary ride that comes from cheap progressive-rate imports.
Key Features
- Progressive spring rate design tuned for the NX350h hybrid AWD chassis weight distribution
- Approximately 1.0 to 1.4 inch front and 1.2 to 1.6 inch rear drop for a leveled factory-plus stance
- Cold-wound Japanese spring steel for consistent load rates and long-term sag resistance
- Corrosion-resistant powder coat finish protects against road salt and moisture
- Engineered to work with factory shocks and struts, no additional damper purchase required
- RSRT525D set includes all four springs for a complete front and rear installation
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2022-2026 | Lexus | NX350h | F Sport |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | RSRT525D |
| Brand | RS-R |
| Drivetrain | AWD |
| Front Drop | 1.0 to 1.4 inch |
| Rear Drop | 1.2 to 1.6 inch |
| Front Spring Rate | 3.59 kg/mm |
| Rear Spring Rate | 4.80 kg/mm |
| Material | Cold-wound spring steel, powder coated |
| Set Contents | 4 springs (2 front, 2 rear) |
| UPC | 4511969420960 |
What’s Included
- 2 front lowering springs
- 2 rear lowering springs
- Installation instructions
About RS-R
RS-R has engineered suspension springs in Japan since 1981, building a reputation on precise spring rate matching for factory dampers rather than one-size-fits-all aftermarket kits. The Down Sus line is developed specifically for daily-driven vehicles that want a lower stance and reduced body roll while retaining a comfortable, livable ride.
FAQ
What is the RSRT525D?
The RSRT525D is a RS-R Down Sus lowering spring set designed for the 2022 to 2026 Lexus NX350h F Sport AWD, dropping the vehicle roughly 1.0 to 1.4 inches in front and 1.2 to 1.6 inches in the rear using factory shocks.
Will this spring set work with my factory shocks?
Yes. RS-R Down Sus springs are engineered to pair with the factory shock absorbers, so no additional dampers are required for installation.
How much does the NX350h drop with RSRT525D installed?
Expect approximately 1.0 to 1.4 inches of drop up front and 1.2 to 1.6 inches in the rear, giving a noticeably tighter fender gap while preserving ride comfort.
Does this fit the non-F Sport NX350h?
RSRT525D is matched specifically to the F Sport AWD suspension tuning. Non F Sport trims may ride differently with this spring rate, so confirm your trim before ordering.
Will lowering springs affect my alignment?
Any change in ride height affects camber and toe. A professional alignment is strongly recommended after installation to protect tire wear and handling.
Is this a full replacement of the strut and shock assembly?
No. RSRT525D replaces only the coil springs and is designed to work with your existing factory strut and shock assemblies.
Can I install these springs myself?
Installation requires a spring compressor and standard suspension tools. Most experienced DIY mechanics can complete the job, though a professional installation is recommended if you are not comfortable working with compressed coil springs.
Does lowering the NX350h with this kit void the factory warranty?
Suspension modifications can affect warranty coverage on suspension-related components. Check with your Lexus dealer regarding your specific warranty terms before installation.
Install Instructions
- Raise and safely support the vehicle, then remove the wheels.
- Support the lower control arm and disconnect the strut assembly from the vehicle.
- Use a spring compressor to safely relieve spring tension and remove the factory spring.
- Install the RS-R lowering spring in the same orientation as the factory spring.
- Reassemble the strut assembly and torque all hardware to factory specifications.
- Reinstall the wheels and repeat on all four corners.
- Lower the vehicle and schedule a full four-wheel alignment.
