The g-Force Rival S is BFGoodrich's Extreme Performance Summer tire developed for sports car, muscle machine and pro-touring car driving enthusiasts who want their tires tuned to lower their run times in solo, autocross, track attack and hill climb events. Created with razor-sharp reflexes, the g-Force Rival S is designed to raise the limits by delivering extreme grip that's extremely predictable. However, like all Extreme Performance Summer tires, it is not intended to be serviced, stored or driven in near- and below-freezing temperatures, through snow or on ice.BFGoodrich g-Force Rival S tires feature an updated tread compound designed to offer maximum dry and improved wet grip, as well as offer quicker warm-up in competition conditions, yet continues to earn a 200 Treadwear rating in Uniform Tire Quality Grade (UTQG) testing. This Silica-infused compound is molded into asymmetric tread designs shared with the original g-Force Rival that are performance-tuned to match tire width (265mm and narrower sizes feature a 3-rib design, while 275mm and wider sizes use a 4-rib pattern). Large, solid outboard tread blocks and BFGoodrich's Extreme Tread Edge (ETE) shoulder design wraps the tread compound farther down the sidewalls for predictable feedback and maximum cornering grip from start to finish. Lateral groove draft angles promote consistent performance and wear, while chamfered block edges resist feathering under extreme cornering and braking.The tire's internal structure features BFGoodrich's Performance Racing Core reinforced internal structure that reduces flex to increase steering response. The tread is stabilized by twin steel belts and an Equal TEnsion Containment System (ETEC System) of spirally wrapped nylon to optimize the tire's contact patch and traction at speed. g-Control sidewall inserts tune the sidewall stiffening to promote steering response.