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A 255 will fit fine. A 40 series sidewall woud be a better match to the stock diameter though.
Thanks for the confirmation. Yeah I know a 40 would be a better match, the reason why I was going to go 45 was to cover up wheel gap and also theres a tire in that size right now thats on sale. I figure the 3% slower won't make a big enough difference to keep me from making the purchase as long as it fits.