Back in 1977, Goodyear introduced the Tiempo, the first tire dubbed all-season. The idea was simple and alluring: Instead of dealing with the hassle of switching between snow and summer tires as the seasons change, drivers could use one tire all the time. Sales skyrocketed and other companies quickly followed suit. These days nearly all vehicles sold in the United States are fitted with all-season tires from the factory, and 97.5 percent of replacement-tire sales are the same. But is that such a good idea? Actually, no. It turns out that all-season tires are fine in warmer months, but in...…Back in 1977, Goodyear introduced the Tiempo, the first tire dubbed all-season. The idea was simple and alluring: Instead of dealing with the hassle of switching between snow and summer tires as the seasons change, drivers could use one tire all the time. Sales skyrocketed and other companies quickly followed suit. These days nearly all vehicles sold in the United States are fitted with all-season tires from the factory, and 97.5 percent of replacement-tire sales are the same. But is that such a good idea? Actually, no. It turns out that all-season tires are fine in warmer months, but in...WW…