BC Racing HM Series — Inverted Dampers with 2-Way Adjustment
The BC Racing HM Series offers the same great benefits as the RM Series and adds 2-way damping adjustment for a serious step up in control. Each kit uses inverted monotube dampers with independently adjustable compression and rebound, so you can tune each direction to suit the car and the surface. The inverted design keeps the vital damper fluid away from heat sources to resist fade, and it lowers unsprung weight by shifting the coilover mass up toward the chassis. With external reservoirs exiting the top of each damper, the HM Series is built for the most demanding drivers on the track.
Inverted Monotube Dampers with Independent 2-Way Control
The HM Series builds on the inverted RM design by separating compression and rebound into independent adjustments. That 2-way control lets you firm up body motion without over-stiffening the ride, or manage compression over rough sections while keeping rebound tight. The inverted monotube layout keeps the damper fluid away from the heat that causes fade under extreme track use, and it trims unsprung weight by moving the majority of the coilover mass up to the chassis, where weight is easier to shave. It is a setup that gives a driver real, direction-specific tuning.
Top-Mounted External Reservoirs for Track-Side Tuning
On the HM Series the external reservoir exits the top of each damper, which opens up an important convenience: the reservoir can be mounted in infinitely variable locations under the hood or in the trunk. That means quick, easy access for adjustment right at the track, without wrestling components buried down at the wheel. Paired with the inverted monotube dampers, the added oil capacity of the reservoirs helps the units run cool and consistent through long sessions. The combination is what makes the HM Series suited to the most demanding drivers.
Fitment, Support, and the Springrates Guarantee
The HM Series is offered for a focused range of chassis, and each kit is engineered for its specific application, so enter your vehicle on the listing to confirm the correct fitment. Every BC Racing coilover is a fully rebuildable monotube design backed by a two-year warranty handled through BC Racing North America, and custom spring rates are available at no extra cost with Swift Spring upgrades offered on request.
At Springrates, we've been an authorized BC Racing retailer since 2005. If you're deciding between series, our coilover comparison guide breaks down every option, and our team is here to help. We'll give you a straight answer.