So I have a 2008 JK. Stock Goodyear Wrangler 255/75/17 Tires. I need to get new tires and would like to go to 265/70/17. There are more options at better prices. If I was to get 4 tires at 265/70/17 would I be safe with saving the old spare? If I had a blowout on the highway or something would I be safe with driving on the (255) and 3 (265)? and for how long?. Help me, my wife is freaking out because she thinks we will need to buy 5 tires if I change the size. I can get (265) at a better price and more aggressive tread if I only have to buy 4.