Swift Springs Expands 13-Inch TH Spring Lineup with New 275 lb Rate

Swift Springs is excited to announce the newest addition to its 13-inch TH spring lineup with the release of a 275 lb/in spring rate. Developed in response to racer feedback, this new rate provides Factory Stock teams with another tuning option to optimize rear suspension performance and chassis balance.

Designed for Factory Stock Racers

Every new product at Swift Springs begins with input from racers, and the new 275 lb/in 13-inch TH spring is no exception. After hearing from Factory Stock competitors looking for a little more support in the left rear, Swift engineers developed a spring that fills the gap between existing rates while maintaining the consistency and durability racers expect.

The result is another setup option that allows teams to better tune their suspension for changing track conditions and maximize traction when it matters most.

Built with Exclusive HS5TW Material

Unlike imitation TH springs, every Swift TH spring is manufactured using Swift's exclusive HS5.TW spring steel, developed and produced entirely in-house.

Swift Springs is more than a spring manufacturer—it's a metallurgy company. Because we produce our own proprietary material, our engineers can fine-tune the composition and characteristics of HS5.TW to meet the exact performance requirements of each spring we build.

This level of material control allows Swift Springs to deliver exceptional consistency, durability, and performance that racers can rely on race after race.

Why Choose Swift TH Springs?

The new 275 lb/in TH spring offers racers:

New 275 lb/in spring rate

13-inch TH spring configuration

Designed for Factory Stock racing applications

Ideal for racers seeking additional left rear support

Manufactured from proprietary HS5.TW spring steel

Precision-built for consistent, repeatable performance

Made entirely in-house by Swift Springs

When suspension consistency is measured in thousandths of a second, the quality of the spring matters. Swift's engineering, metallurgy expertise, and precision manufacturing ensure every spring performs exactly as intended.

Available Now

The new 275 lb/in 13-inch TH spring is currently in stock at Swift Springs and is shipping to authorized dealers across the country.

This latest addition is another example of Swift Springs' commitment to listening to racers and developing products that meet the evolving demands of grassroots and professional motorsports alike.

When racers ask, Swift Springs delivers—and the new 275 lb/in TH spring is ready to help Factory Stock teams find more traction, better balance, and another trip to Victory Lane.