31. In the early 1970s, steel-belted radial tires were new. 32. Michelin began making radial tires in Greenville in 1975. 33. That gives a radial tire roughly 20 percent less rolling resistance than a bias-ply tire. 34. The Aurelia was also first car to be fitted with radial tires as standard equipment. 35. Steel-belted radial tires became standard equipment on all Matadors. 36. This allows vehicles with radial tires to achieve better fuel economy than with bias-ply tires. 37. Several current car models have been fitted with radial tires that have incorporated the silica blend. 38. Radial tires are probably the biggest single reason.39. It took many years before seat belts, air bags, radial tires and antilock brakes became commonplace. 40. Modifications to the jets include tougher radial tires and reinforced fuel tanks lined with bulletproof Kevlar.
