QA1 10HT850B High-Travel Linear Coilover Spring, 2.5in ID x 10in, 850lb, 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) 850 lb/in. rate - not variable/progressive
• A silver-finish version of this same rate and length (10HT850, 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: 10 in.
• Rate: 850 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 10HT850B is a high-rate, high-travel coilover spring for heavier vehicles or setups that need serious load support without sacrificing suspension travel. At 850 lb/in., it's one of QA1's stiffer offerings in the 2.5 in. I.D. high-travel line, and its linear rate keeps the feel consistent through the full stroke rather than ramping up as it compresses.

Built from chrome silicon alloy wire with fewer coils than a conventional spring, it compresses further before reaching coil-bind, so you can use more of the available travel before bottoming out. The black powder-coat finish gives it a cleaner, more stealth appearance under the car compared to QA1's standard silver springs, while remaining fully interchangeable with any 2.5 in. I.D. coilover shock.