BC Racing RM Series 15-19 Hyundai Sonata LF Chassis / 16-20 Kia Optima JF Chassis

Item SKU: M-24-RM

BC Racing RM Series coilovers for the 2015-2019 Hyundai Sonata LF chassis and 2016-2020 Kia Optima JF chassis. This is the M-24-RM vehicle-specific kit, built around the RM Series inverted monotube damper design rather than a universal coilover setup.

• Fitment: Designed for 2015-2019 Hyundai Sonata models with the LF chassis and 2016-2020 Kia Optima models with the JF chassis.
• RM Series damper design: The RM Series uses an inverted monotube layout for McPherson-style strut applications. The larger damper mass sits higher in the chassis, reducing unsprung weight compared with a conventional upright strut design.
• Strut load handling: Inverted RM struts use a larger piston shaft to deal with the lateral loads that come with a McPherson-strut suspension layout.
• Ride-height adjustment: Height adjustment is independent of spring compression, so you can set the car's ride height without using spring compression as the height adjustment.
• Damping: BC Racing lists a linear piston and damping curve for the RM Series, giving the damper a consistent response through its stroke.
• Serviceability: RM Series dampers are rebuildable, with application-specific spring-rate and valving options available when a different setup is needed.

The useful part of this stuff is the separation between ride height and spring compression. You can work on stance and clearance without treating the spring perch like the only adjustment available. The inverted strut design also puts the focus where it should be for this type of suspension: controlling the strut under the loads it sees in corners.