My dad has had an 80 since the early 2000's and we are trying to fixer her up so I can take it to college in Colorado. We thought a good place to start is tires since what is on there looks like something waiting to explode. We want it to be outfitted to handle almost any situation we could get it in and for this reason we have been leaning toward 315/75R16s but I keep hearing about the need to re-gear and how hard it will be on the transmission. I just see so many cruisers with these 35s and thought I could use a little guidance since I don't really know the lay of the land when it comes to tire size and it's impact on the gears and transmission.