What size tires come on a standard, stock Chevy truck?

There is no single "standard" tire size for a Chevy truck, as different models and trims come with different size tires. For example, the base model of the Chevy Silverado 1500 comes with 17-inch tires, while the top-of-the-line High Country trim comes with 20-inch tires. Similarly, the base model of the Chevy Colorado comes with 16-inch tires, while the ZR2 off-road model comes with 17-inch tires. As such, it is best to consult the specific model and trim level of a Chevy truck to determine the tire size.