Tein GSM64-8USS2 Street Basis Z Coilovers for 1990-05 Mazda Miata RWD

Vehicle Fitment

• 1990-1998 Mazda Miata (NA6C/NA8C, RWD)
• 1999-2005 Mazda Miata/MX-5 (NB8C, RWD)

Features

• Tein Street Basis Z coilover suspension kit for lowered ride height
• Twin-tube damper design for smooth ride quality
• Thread-type adjustable ride height via ZT-coated sleeve
• Fixed damping for simpler setup and consistent feel
• OEM upper mount reuse for reliable fitment
• Powder-coated shock bodies for rust and corrosion resistance
• Durable dust boots to protect piston rods from debris
• Improved stance and handling over stock suspension

Specifications

• Part Number: GSM64-8USS2
• Series: Street Basis Z Coilovers
• Damping Adjustment: Fixed (non-adjustable)
• Ride Height Adjustable Range (NA): approx. -25 to -77 mm front, -20 to -70 mm rear
• Ride Height Adjustable Range (NB): approx. -33 to -98 mm front, -19 to -95 mm rear
• Spring Rates: Front ~7.0 kgf/mm, Rear ~6.0 kgf/mm
• Upper Mounts: Reuses OEM upper mounts
• Drive Type: Rear-wheel drive only

Included Components

• 2x front coilover assemblies
• 2x rear coilover assemblies
• 4x threaded spring seats
• 4x spring lock collars
• 4x dust covers
• 4x rubber bump stops
• 4x Delrin thrust washers
• 1x instruction manual

Product Description

The Tein Street Basis Z Coilover Kit (Part No. GSM64-8USS2) is an affordable, height-adjustable suspension upgrade designed specifically for Mazda Miata and MX-5 roadsters from 1990 through 2005. This kit replaces the stock shocks and springs with a twin-tube coilover setup that provides lowered ride height and improved handling over factory suspension while maintaining comfort for street use. The ride height can be adjusted through the threaded ZT-coated sleeves, allowing owners to dial in stance and handling to their preferences without changing damper internals.

Featuring durable powder-coated bodies and robust spring materials, the Street Basis Z is built to resist corrosion and deliver dependable performance. Because this kit uses OEM upper mounts, it installs without the need for additional top-hat components, simplifying installation. While damping is fixed (non-adjustable), the overall design enhances cornering stability and stance compared with stock suspension. This coilover kit is a popular choice among Miata enthusiasts seeking a balance of everyday comfort, ride-height adjustability, and improved handling.