According to information I've collected:
Stock XLT tire: 275/65-18, 32.1 inches diameter, 629 revolutions/mile
Stock Timberline tire: 265/70-18, 32.6 inches, 619 rev/mile
Stock Limited tire: 275/55-20, 31.9 inches, 632 rev/mile
Stock Limited Stealth tire: 285/45-22, 32.1 inches, 629 rev/mile