Stock tire brand for 2005 Chevy Silverado 1500?

The stock tire brand on a 2005 Chevy Silverado 1500 varied depending on the trim level, options selected, and even the specific dealer. There wasn't one single brand used across the board. Common brands that were likely included Goodyear, Michelin, and BFGoodrich. To know for certain what tires were originally on *your* specific truck, you'd need to check the original paperwork (window sticker, etc.) or look for markings on the tires themselves (if they're still the original set).