ST Suspensions Coilover Kit – BMW 128i / 135i / 135is Convertible (E88)

OVERVIEW

The ST X coilover kit for the E88 1 Series convertible replaces the factory struts and springs with a height-adjustable coilover set, letting you dial in ride height and stance without giving up everyday usability.

ST is the value brand of KW Automotive. The ST X is the entry point in the coilover range: a fixed-damping, height-adjustable kit built on galvanized zinc-coated steel struts with a friction-optimized composite spring perch and stainless steel insert. Dampers are hand-assembled and quality-tested before they leave the factory.

SPECS

• Damper family: ST X (height adjustable, fixed damping)
• Front lowering range: 1.4 in to 2.4 in
• Rear lowering range: 1.4 in to 2.4 in
• Damping adjustment: none (fixed valving)
• Strut material and finish: galvanized zinc-coated steel
• Spring perch: friction-optimized composite with stainless steel insert
• Adjustable dampers are only offered on the ST XA and ST XTA ranges

PARTS INCLUDED

• Complete coilover kit as supplied by ST Suspensions; see the installation instructions included in the box for the full bill of materials.

TECH RESOURCES

Additional Parts Required

• Four-wheel alignment. A full four-wheel alignment is mandatory after installation and after any subsequent ride-height change.
• Professional installation. Spring compressors and strut service tools are required.
• Check EDC compatibility. This is a passive coilover kit that replaces the OEM dampers. Confirm your car is not fitted with Electronic Damping Control before ordering.

Installation

• Vehicle-specific installation instructions are supplied in the box with the kit.
• ST does not publish a public download link for this kit's instruction sheet. Contact Speed Logic if you need a copy before the kit arrives.

Notes

• Fits the E88 convertible only. Confirm your chassis code with Speed Logic before ordering.

PART NUMBER

• 13220062

VEHICLE APPLICATIONS