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The front springs have a spring rate of 207 lbs./inch. These street springs interchange exactly with the stock rear springs on the 2001-05 Miata and drop about one inch from stock height.
The rear springs have a rate increase of 23% and drop about one inch from stock. The rear springs have a spring rate of 145 lbs./inch. Racing Beat's Miata springs are progressively wound and will not loosen when the chassis is raised.
Price is for a FULL set of FOUR springs.