I have a 98 Ranger XLT. Had to quickly replace all of my tires with the little money I had at the time. I don't remember what the old tire size was, but I replaced the rubber and kept the rims and my dad had a set of 215/70r15 in his basement slightly used. But after having them put on I researched and found out that they need to be 75 instead of 70. Being that I don't have the funds what are the pros and cons of keeping the tires?