TEIN SB090-01200 Standardized Straight Coil Spring ID - 70mm 200mm 9kg/mm

The TEIN SB090-01200 is a universal standardized straight coil spring featuring a 70mm inner diameter, 200mm free length, and a 9 kgf/mm (504 lbs/in) spring rate. Designed for coilover suspension systems, this linear-rate spring is an excellent choice for both street performance and motorsports tuning applications.

TEIN standardized springs are manufactured from SWOSC-KV silicon chrome steel (JIS standard), engineered to deliver maximum tensile strength and long-term durability. A proprietary cooling formation process ensures stable spring rate consistency and resistance to sagging — even after repeated full compression where coils make contact.

Key Features:

• Spring Type: Straight (single inner diameter from top to bottom)
• Inner Diameter (I.D.): 70mm
• Free Length: 200mm (7.87 in)
• Spring Rate: 9 kgf/mm (~504 lbs/in)
• Material: SWOSC-KV silicon chrome steel, JIS standard
• Flat top and bottom design — compatible with standard coilover spring seats
• Will not permanently deform or sag after full coil bind
• Black finish
• Sold as a pair (2 springs of the same part number)

A compatible spring seat is required for installation. The straight design maintains a consistent inner diameter throughout its length, making it ideal for coilover setups using standard upper and lower perches. Suitable for suspension tuning or as a replacement spring in existing coilover systems.