Swift Springs Coilover Assist Springs - ID: 60mm (2.37") Spring Rate (kgf/mm):5.0 2016 BMW 4 Series 428i/430i

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Swift Springs Coilover Assist Springs - ID: 60mm (2.37") Spring Rate (kgf/mm):5.0 2016 BMW 4 Series 428i/430iSwift Springs Coilover Assist Springs in 60mm (2. 37") ID provide a dynamic step linear rate that fine tunes rebound travel and prevents inside wheel lift during hard cornering. Unlike helper springs that have minimal rate contribution, Swift assist springs use a heavier rate to actively manage suspension behavior during droop. Every Swift assist spring compresses to the same height regardless of rate, allowing drivers to swap between rates without