Product Details
RS-R Super Down Sus springs for the 2014-2018 Infiniti Q50 Hybrid RWD deliver an aggressive, tucked stance without giving up daily drivability. The progressive-rate coils close up the fender gap, drop the center of gravity and tighten body roll through corners, while RS-R’s vehicle-specific rate tuning keeps the ride compliant on rough pavement.
The Super Down Sus takes RS-R’s progressive-rate Down Sus platform and dials in a more aggressive drop for drivers who want real stance without jumping to a full coilover. Every set is cold-wound in Osaka, Japan to a vehicle-specific rate so the car stays daily-capable at the lower ride height. Covered by RS-R’s 3-year / 50,000 km spring-fatigue warranty.
Features
- Aggressive drop for a deeper, more tucked stance
- Progressive-rate winding keeps the ride streetable
- Vehicle-specific — tuned to OE damper valving
- Cold-wound SAE alloy steel with powder coat
- 3-year / 50,000 km RS-R spring-fatigue warranty
- Made in Osaka, Japan
Specifications
| Part Number | N129S |
| Part Name | RS-R Super Down Sus Lowering Springs |
| Vehicle | 2014-2018 Infiniti Q50 Hybrid |
| Drivetrain | RWD |
| Ride-Height Adjustable | No |
| Spring Type | Progressive |
| Approximate Drop - Front | -35mm to -40mm (-1.4in to -1.6in) |
| Approximate Drop - Rear | -25mm to -30mm (-1.0in to -1.2in) |
| Spring Rate - Front | 7.36 Kg/mm |
| Spring Rate - Rear | 3.67 Kg/mm |
| Warranty | 3 Years / 50,000 km |
Vehicle Fitment
- 2014 Infiniti Q50 Hybrid
- 2015 Infiniti Q50 Hybrid
- 2016 Infiniti Q50 Hybrid
- 2017 Infiniti Q50 Hybrid
- 2018 Infiniti Q50 Hybrid

