Unsafe at Any Speed by Ralph Nader, published in 1965, is a pioneering book accusing car manufacturers of being slow to introduce safety features, and reluctant to spend money on improving safety. The subject for which the book is probably most widely known, the rear-engined GM Chevrolet Corvair, is covered in the first chapter. It relates to the first (1960–1964) models that had a swing-axle suspension design which was prone to 'tuck under' in certain circumstances. In substitution for the cost-cutting lack of a front stabilizer bar (anti-roll bar), Corvairs required tire pressures that were outside of the tire manufacturer's recommended tolerances. The Corvair relied on an unusually high front to rear pressure differential (15 psi front, 26 psi rear, when cold; 18 psi and 30 psi hot), and if one inflated the tires equally, as was standard practice for all other cars at the time, the result was dangerous over-steer.