TEIN GSY60-81SS2 Street Basis Z Coilover Kit

The TEIN GSY60-81SS2 Street Basis Z is a complete coilover suspension kit engineered for street-driven performance. Designed as an entry-level coilover system, the Street Basis Z delivers a well-balanced combination of ride comfort, lowered stance, and improved handling over the factory suspension—all at an accessible price point.

TEIN achieves this value through its innovative Sealed Structure manufacturing process, in which the top of the shell pipe is narrowed, oil and gas are injected, and the unit is sealed by crimping the metal. This streamlined production method significantly reduces manufacturing costs without sacrificing quality.

Key Features:

• Thread-Type Ride Height Adjustment: Ride height is adjusted by repositioning the lower spring seat up or down along the threaded body, offering a simple and reliable lowering solution
• Twin-Tube Damper Design: Compared to mono-tube systems, the twin-tube configuration achieves longer stroke with reduced repulsive force, resulting in improved ride comfort over varied road surfaces
• High-Performance Damper Oil: TEIN's proprietary damper oil maintains stable viscosity across a wide temperature range, resists cavitation and foaming, and delivers consistent damping performance over the long term
• TEIN-Green Powder Coat Finish: A two-layer, one-bake powder coating process applied over a blasted surface provides exceptional corrosion resistance and durability
• ZT Coating on Adjustment Threads: TEIN's unique ZT surface treatment protects the ride height adjustment threads from abrasion caused by gravel and debris, and further enhances rust resistance
• Uses OEM Upper Mounts: Both front and rear positions retain the vehicle's original upper mounts, simplifying installation
• Springs Included: Front and rear springs (3.0 kgf/mm / 168 lbs/in) are included with the kit

Specifications:

• Front Spring Rate: 168 lbs/in (3.0 kgf/mm)
• Rear Spring Rate: 168 lbs/in (3.0 kgf/mm)
• Front Spring Free Length: 250 mm (9.84 in)
• Rear Spring Free Length: 250 mm (9.84 in)
• Front Spring Inner Diameter: 70 mm (2.76 in)
• Rear Spring Inner Diameter: 70 mm (2.76 in)
• Front Vehicle Height Adjustment: -50 mm nominal; Range -70 mm to -34 mm (Max), -60 mm to -40 mm (Recommended)
• Rear Vehicle Height Adjustment: -40 mm nominal; Range -67 mm to +4 mm (Max), -50 mm to -30 mm (Recommended)
• Damping Force Adjustment: Fixed (No adjustment)
• Full-Length Adjustable: No
• EDFC Compatible: No

Manufactured and assembled at TEIN's facility in Yokohama, Japan, the Street Basis Z is an ideal upgrade for daily drivers seeking a lowered stance and a more composed, responsive ride without sacrificing everyday usability.