Product Details
The Riaction GT1 Coilovers for the 2011-2015 Kia Optima TF deliver a premium, adjustable suspension upgrade built for drivers who want more from their Optima TF than the factory setup can offer. These Kia Optima coilovers are engineered to pair street comfort with canyon and track capability, giving you the stance, handling, and adjustability you've been chasing without compromising daily driveability. Whether you track your TF Optima on weekends or log daily miles, this TF coilover kit dials in ride height and damping to match how you actually use the car.
Every GT1 set features a monotube damper with 32 levels of damping adjustment, so you can tune ride quality to match the road, the weather, or your driving mood. Full-length ride-height adjustment separates preload from ride height — meaning you can drop the Optima TF to the height you want while preserving spring travel and shock stroke. Riaction coilovers for the 2011-2015 Kia Optima are fully rebuildable and backed by a 2-year warranty, making the GT1 a long-term suspension investment rather than a disposable upgrade.
GT1 Series Technology
- Monotube linear damper with seamless 52mm electroplated carbon steel body
- 32-level damping adjustment (1-Way)
- 44mm CNC-machined 6061 aluminum high-flow piston
- 20mm piston rod for MacPherson applications / 14mm for non-MacPherson
- SAE9254 cold-wound linear main springs
- Multi-thickness valving shims for consistent damping
- Polyurethane oil seals and 7.5W suspension fluid
- Low-gas-pressure design for improved compliance
- Fully rebuildable — built to be serviced, not replaced
Features
- Full-length ride-height adjustment (preload-independent)
- 32 levels of damping adjustment
- Front camber adjustment via pillowball top mounts
- Optional Swift Springs upgrade (sold separately)
- 2-year limited warranty
Specifications
| Part Number | KA-002-LT |
| Part Name | Riaction GT1 Coilovers |
| Vehicle | 2011-2015 Kia Optima |
| Chassis Code | TF |
| Adjustment Type | 1-Way |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 6 Kg/mm |
| Spring Rate - Rear | 7 Kg/mm |
| Top Mounts - Front | Pillowball with camber plate |
| Top Mounts - Rear | OEM |
| Camber Plates - Front | Yes |
| Camber Plates - Rear | No |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear |
Vehicle Fitment
- 2011 Kia Optima (TF)
- 2012 Kia Optima (TF)
- 2013 Kia Optima (TF)
- 2014 Kia Optima (TF)
- 2015 Kia Optima (TF)