View Here : Tire Size Comparison
Many times when converting from a bias ply farm tire to a radial farm tire is necessary to convert from the standard tire size to the metric tire size. Below is a chart of standard farm tire sizes and their metric equivalent.
RV tire sizes are determined by the size of the rims, which are usually between 14.5 inches to 19.5 inches in diameter on the larger rigs. Half-inch measurements are typically found on heavy-duty trucks and trailers, which are used as chassis for the larger RVs.