QA1 12HT550B High-Travel Linear Coilover Spring, 2.5in ID x 12in, 550lb, Black

Compatibility

• Universal - fits any front or rear coilover shock with a straight (non-tapered) 2-1/2 in. I.D. spring perch
• Compatible with standard 2.5 in. I.D. coilover hardware, including QA1 Pro Coil and Stocker Star systems

Fitment Notes

• Sold individually
• Linear (constant) 550 lb/in. rate - not variable/progressive
• A silver-finish version of this same rate and length (12HT550, no "B") is sold separately if you prefer that finish

Features

• Linear spring rate stays constant through the full stroke for predictable, consistent handling
• High-travel design - smaller-diameter chrome silicon wire and fewer coils allow more compression before coil-bind
• Lightweight construction reduces unsprung weight for quicker suspension response
• Black powder-coat finish for a stealth look and corrosion resistance
• Ground, squared ends for straight, consistent operation
• Suitable for racing, off-road, and high-performance street use
• Lifetime warranty - guaranteed to remain within 2% of original free height and rate

Specifications

• Length: 12 in.
• Rate: 550 lb/in. (linear)
• Inside Diameter: 2-1/2 in. (upper and lower)
• Spring Type: Straight (non-tapered)
• Upper Grind: Flat
• Finish: Black powder coat

Included Components

• 1x Coilover Spring

Product Description

The QA1 12HT550B is a longer-length, high-rate coilover spring for setups that need both extra travel and firm support - a common combination on taller-travel front or rear coilover applications. At 12 in., it suits shocks with a longer body/stroke than the more common 9-10 in. options, while the 550 lb/in. linear rate keeps the feel consistent through the full stroke rather than building progressively.

Built from chrome silicon alloy wire with fewer coils than a standard spring, it compresses further before reaching coil-bind, so more of the available travel is usable before bottoming out. The black powder-coat finish gives it a cleaner, more stealth look under the car, while remaining fully interchangeable with any 2.5 in. I.D. coilover shock.