The easiest way to find out if a tire will fit a rim is ask at a tire shop. Most manufacturers have a minimum/maximum rim width listing in their catalogue. I sell a lot of tires at work and have checked the rim vs. tire width for the 245/45r16 and the minimum most recomend is a 8" rim. There are a couple of exceptions but they list a 7.5". The 225 is the largest tire that will fit on a 6" rim. No reputable shop would even try the 245, to much chance of the tire unseating from the bead.

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Darren Schoff
90 Laser Turbo