HKS Hipermax R Coilovers (9K Front / 10K Rear) - 2013-2021 Scion FR-S / Subaru BRZ / Toyota 86

Hipermax R Coilovers for the 2013-2021 FR-S, BRZ, and 86

The HKS Hipermax R Coilovers at 9K front and 10K rear for the 2013-2021 Scion FR-S, Subaru BRZ, and Toyota 86 are HKS's performance-focused coilover for the first-generation FT86 platform. The R designation sits above the HIPERMAX S in the HKS lineup. Firmer spring rates, stiffer damping, calibrated for drivers who take the FT86 to the track regularly. The asymmetric 9K/10K spring rate is the same logic applied to the second-generation chassis: the stiffer rear rate supports the platform's weight distribution in high-load cornering.

Specs & Highlights

• 9K front / 10K rear spring rates
• Performance-oriented damper valving
• Height adjustable
• Designed for track-focused use on the FA20 chassis
• Asymmetric spring rates for platform-specific balance
• Fitment: 2013-2021 Scion FR-S / Subaru BRZ / Toyota 86

9/10 kgf/mm, 46mm Inverted Strut, -20 to -50mm

The AT001 runs 9 kgf/mm (504 lbf/in) front and 10 kgf/mm (560 lbf/in) rear, the same rates as the second-generation AT006 application. The 46mm inverted strut design provides better camber curve control at the higher spring rates than a conventional strut would. Ride height adjustment is -20mm to -50mm front and -15mm to -45mm rear. The asymmetric 9/10 spring rate was derived from HKS's time attack testing on the FT86 platform, where a stiffer rear relative to front was found to produce the most consistent neutral handling balance across a full track session.

Asymmetric Spring Rates from HKS Time Attack Testing

The FA20 chassis in the original FR-S and BRZ is one of the best-balanced platforms for coilover work. The neutral weight distribution and low center of gravity respond well to proper spring and damper calibration. The Hipermax R takes advantage of that by providing rates that allow the suspension to work correctly through the full range of performance driving inputs.

Performance Coilover, Not a Street Compromise

The Hipermax R does not try to be compliant for daily driving. It is a performance coilover for an owner who has decided what the car is for. Ride quality on imperfect surfaces is firm. On smooth tarmac and at the track, the R delivers handling that justifies its position in the HKS lineup. Four-wheel alignment after installation is required.

The FT Breakdown

The Hipermax R at 9K/10K is HKS's recommendation for FR-S, BRZ, and 86 owners who track their car regularly. The HIPERMAX S is the better choice for mixed-use. If the car goes to autocross events, time trials, or track days with any regularity, the R is the correct specification. The 9/10 kgf/mm asymmetric rates derived from HKS time attack testing of the first-generation FT86 platform are a specification that has been validated across hundreds of track sessions by HKS and their affiliated teams. When a company that campaigns race cars tests a suspension setup on the same platform you are working with, the spring rate recommendation carries a different level of authority than a calculation from first principles.