Im getting new tires for my jeep and i am about to go nutz. It came with 215/75/15 and i want to go just a little larger but not to much because my 4 cyl. cant handle it. I have been thinking about some 225 0r 235/ 85. But most of what i am finding is in like 27-35. Now im guessing 27's and 28's are around the same as 225 or 235's but im not sure. I have not been able to find a conversion chart that i understand. could someone help me?