Product Details
HKS Hipermax S coilovers for the 2012+ Lexus GS250 RWD (GRL10) are engineered for drivers who want genuine performance gains without giving up daily-driver comfort. Built around HKS's FLAT RIDE CONCEPT, the Hipermax S smooths out low-speed harshness while keeping the Lexus GS250 RWD planted under hard cornering — delivering the refined, controlled ride quality that makes a coilover worth owning on the street.
30-level damping adjustment, a large-diameter monotube damper, Dual PVS, and DURA BOOTS give the Hipermax S its signature mix of long-life durability and tunability. Length-adjustable shock bodies let you lower the Lexus GS250 RWD without pre-loading the spring, and every kit is backed by HKS's class-leading 3-year / 60,000 km warranty — validated over 60,000 km of real-world testing before it ever leaves Japan.
Features
- Monotube damper construction — separates gas/oil for stable damping under heat
- 30-level damping adjustment via the WR Needle valve system
- FLAT RIDE CONCEPT tuning — absorbs low-speed road harshness, controls body roll
- Dual Preload Valve System (Dual PVS) — tuned per chassis
- DURA BOOTS — new-spec dust boots with improved heat, weather, and ozone resistance
- Advanced Bump Rubber Plus — progressive, early engagement
- Reinforced rubber upper mounts (pillowball optional on select SKUs)
- HKS in-house cold-formed springs with printed spring rates
- PNE corrosion coating on threaded surfaces
- Length-adjustable shock body — preload-independent height adjustment
- 3-year / 60,000 km warranty (validated through real-world driving)
- Rebuildable — dust boots and stabilizer links now covered
- Made in Japan
Specifications
| Part Number | 80300-AT005 |
| Part Name | HKS Hipermax S Coilovers |
| Vehicle | 2012+ Lexus GS250 RWD |
| Chassis Code | GRL10 |
| Country of Origin | Japan |
| Damping Adjustment | 30-Level 1-Way |
| Height Adjustable | Yes |
| Spring Rate - Front | 8.0 Kg/mm |
| Spring Rate - Rear | 10.0 Kg/mm |
| Spring Length - Front | 250mm |
| Spring Length - Rear | 220mm |
| Upper Mount - Front | Rubber |
| Upper Mount - Rear | Rubber |
| Ride Height Range - Front | -38mm (0mm to -70mm) |
| Ride Height Range - Rear | -45mm (-32mm to -81mm) |
| Warranty | 3-year / 60,000 km |
Important Fitment Notes
- Ride height data based on GRL10
- When ordering, change rear springs from 10K-220 to 12K-220
- When ordering, change rear springs from 10K-220 to 12K-220. Confirmed on GS450h F Sport
- Confirmed on RC350 F Sport
Vehicle Fitment
- 2012 Lexus GS250 RWD (GRL10)
- 2013 Lexus GS250 RWD (GRL10)
- 2014 Lexus GS250 RWD (GRL10)
- 2015 Lexus GS250 RWD (GRL10)
- 2016 Lexus GS250 RWD (GRL10)
- 2017 Lexus GS250 RWD (GRL10)
- 2018 Lexus GS250 RWD (GRL10)
- 2019 Lexus GS250 RWD (GRL10)
- 2020 Lexus GS250 RWD (GRL10)
- 2021 Lexus GS250 RWD (GRL10)
- 2022 Lexus GS250 RWD (GRL10)
- 2023 Lexus GS250 RWD (GRL10)
- 2024 Lexus GS250 RWD (GRL10)
- 2025 Lexus GS250 RWD (GRL10)
- 2026 Lexus GS250 RWD (GRL10)