I'm looking to buy rims/tires. And learning what can be done at this point. I assume as you go up in wheel diameter, you go down in profile size in order to keep overall diameter in check. I like the look of slightly wider rims. In an 18 or 19 in wheel. Your 245 tires...Are your rims 8in or 8.5in wide? what is the offset of stock tires?