agricultural tires size for 20.8-38, 18.4-38, 18.4-30, 18.4-34, 15.5-38, 11.2-38, 16.9-30, 16.9-34, 16.9-28, 14.9 -28, 13.6-28, 13.6-24, 12.4-28, 12.4-24, 11.2-28, 11.2-24, 9.5-24, 9.5-20, 8.3-24, 8.3 -20, 7.50-20, 7.50-16, 6.00-12, 5.50-17, 14.9-24, 5.00-12, 6.00-16 DOT, CCC, ISO certificate