My suspension setup is a little higher than stock fiesta height. I can get cheap 15 inch rally tires with dimensions 195/50. Before that I drove 16 inch 195/50 tires BUT without reinforced sidewalls (so essentially street tires) and ride hide was ok on mixed gravel/ashphalt track! So if theoretically radius is decreased by 0.5 inch: will ride height rly be affected by 0.5 inch or will the the stiffer sidewalls result in less lowering during actual driving on gravel?