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Where the
bearing sits.

At the bottom of the coilover spring, on top of the adjustable lower perch. Inside the two-piece housing, a needle bearing and thrust washers let the perch turn without turning the spring.

Exploded V1 render: blue upper housing, thrust washer, needle bearing, o-rings and silver lower housing, stacked apart.
Exploded V1 render: blue upper housing, thrust washer, needle bearing, o-rings and silver lower housing, stacked apart.

V1 specs.

For the original adapter made in Bend, Oregon. Dimensions checked against the V1 CAD design on October 7, 2026. Material comes from the 2021 product page. V2 will get its own specs when it's ready.

Coilover size
60 mm
Stack height
20 mm
Material
Anodized 6061-T6 aluminum
Bearing (ID x OD x thickness)
AXK 6085: 60 x 85 x 3 mm
Thrust washers (each, two total)
60 x 85 x 1 mm
Housing outside diameter
91 mm
Through bore
53 mm
Lower perch recess diameter
61.5 mm
Spring locator outside diameter
60 mm
60 mm locator shoulder above seating face
5 mm

The 20 mm stack is measured from the lower housing base to the spring seating face, excluding the spring locator. These are nominal CAD dimensions, not manufacturing tolerances.

AdapterSpringLower perchLock ringBody20 mm
SchematicProportions approximate. The 20 mm stack height is to scale.

On the bench and in the car.

Two BC Racing coilovers on a workbench with blue V1 adapters fitted under the bottom of the springs.
Two BC Racing coilovers on a workbench with blue V1 adapters fitted under the bottom of the springs.
V1 adapter installed on a car, between the bottom of a blue spring and the green lower perch of the coilover.
V1 adapter installed on a car, between the bottom of a blue spring and the green lower perch of the coilover.
Close view of a V1 adapter installed between a black spring and the red lower perch of a coilover.
Close view of a V1 adapter installed between a black spring and the red lower perch of a coilover.