QA1 15HTFB325 Chrome-Silicon High Travel Coil-Over Spring 2-1/2" ID 15" 325 lb/in Silver Powder Coat

The QA1 15HTFB325 is a chrome-silicon high travel coil-over spring engineered for demanding street and track suspension applications. Featuring a 2.5" lower inner diameter, 2.125" upper inner diameter, 15" free length, and a 325 lb/in spring rate, this barrel-style spring delivers a precisely tuned linear rate for consistent, predictable suspension behavior.

High Travel Design:

• Manufactured from high-tensile chrome-silicon (Cr-Si) alloy wire for superior strength-to-weight ratio
• Fewer coils and reduced wire diameter increase coil spacing, maximizing available suspension travel
• Can be compressed to coil-bind without affecting spring rate or free height
• Reduced unsprung weight allows faster suspension response and optimized handling

Premium Construction & Finish:

• Cold wound, heat treated, and shot peened for consistency, accuracy, and long service life
• Both ends ground flat for straight, consistent, and accurate operation
• Silver powder coat finish provides excellent corrosion resistance and longevity
• Spring rate and length clearly marked for quick identification
• Compatible with standard 2.5" I.D. coilover hardware

Quality Assurance:

• Proudly Made in the USA
• Backed by QA1's lifetime warranty — guaranteed to remain within 2% of original free height and spring rate under normal operating conditions

The QA1 15HTFB325 high travel coil spring is a top choice for performance enthusiasts looking to maximize suspension travel without sacrificing durability or spring rate accuracy, whether building a dedicated race car or a high-performance street machine.