I, like many worry about the sidewall height on the OEM 20 inch rims for driving on some gravel/forest roads. I have an opportunity to purchase some brand new Subaru Outback rims that are 18 inch by 7.0 wide. with the 5x114.3 bolt pattern and 55 offset. The OEM rims on my Ascent are 20 x 7.5 wide. The tires I want to put on are 245/60R R18 105H. Does the .5 inch width difference cause a problem or is the .5 decrease in width a safety concern?