Swift Springs Standard Conventional Spring (Progressive) - OD: 5" / Length: 6.7" Aspire Part Number 10HTSF450 Part Name

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Swift Springs Standard Conventional Spring (Progressive) - OD: 5" / Length: 6.7" Aspire Part Number 10HTSF450 Part NameSwift Springs Standard Conventional Springs (Progressive) in 5" OD and 6. 7" length feature a dual rate design purpose built for circle track racing applications that require a softer initial rate transitioning to a stiffer rate under heavy load. This 5" OD Swift progressive race spring is manufactured in Japan from proprietary H5S. TW high tensile alloy steel, delivering the variable rate behavior that helps circle track racers maintain traction