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In page Tucker 48:

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Suspension designs, especially the front suspension, had to be changed throughout development. Rather than steel springs, Tucker used an elastomeric (rubber) 4-wheel independent[1] suspension similar to what was used on the race cars he developed with Harry Miller at the Indianapolis 500. The rubber elastomers were developed with assistance from the Firestone Tire Company and used a special vulcanization process to produce a specific spring rate.[citation needed]