The Chevrolet SSR combines the features of a convertible roadster and a pickup truck with a power convertible hardtop and a covered cargo bed. Response from customers and media was so strong that General Motors decided in August 2000 to produce the innovative roadster. When development of the production version of the SSR began in early 2001, Goodyear received the go- ahead to begin engineering and computer-modeling tire candidates.
GM selected the proven Eagle RS-A (Rally Sport-Asymmetric) all-season performance-tire design based on three-dimensional virtual tire models. Eagleburger said computer tools and an accelerated schedule for the SSR (Super Sport Roadster) program allowed Goodyear to submit tires by June.
Front and rear tire size differentials provide maximum balanced handling. Computer modeling determined optimum wear balance and traction capabilities before pre-production tires were manufactured, he said.
The H speed-rated tires are capable of sustained speeds up to 130 mph. A wide tread width delivers excellent dry traction. Higher lateral stiffness on the tire outside shoulder offers improved dry handling, he added.
Lower stiffness and increased blading on the inside shoulder of the asymmetrical tread pattern provide increased wet- and snow-traction. Asymmetrical circumferential grooves add to the Eagle RS-A all-season capability. Steel- and nylon-reinforced tread belts enhance the tire's steering response.
Nick Hill, Goodyear automotive engineer for General Motors, said Chevrolet also sought ride comfort and precise handling — delivered by an optimized tire shape and lateral groove density.
Eagle RS-A tires in these unique sizes will be made in Goodyear's Lawton, Okla., manufacturing facility.
