QA1 10HT375 High-Travel Linear Coilover Spring, 2.5in ID x 10in, 375lb/in

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) 375 lb/in. rate - not variable/progressive
• Also available in 7, 9, 12, 14, and 16 in. lengths at many other rates if 10 in./375 lb isn't the right combination for your setup

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

Included Components

• 1x Coilover Spring

Product Description

The QA1 10HT375 is a high-travel coilover spring built around a linear 375 lb/in. rate, so the spring's resistance stays consistent through the entire stroke rather than ramping up like a progressive design. That predictability is the point - QA1 positions their linear high-travel springs as the more controlled, race-proven option compared to progressive-rate alternatives.

Made from chrome silicon alloy wire with fewer coils than a conventional spring, it compresses further before reaching coil-bind, letting you use more of your available suspension travel without bottoming out. As a 2.5 in. I.D. spring, it drops into any coilover shock built around that diameter.