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ive seen a 255 on a 7" rim! oh yeah it looked like hell though. Im running 245's all around on 8" rims and they are excellent- im sure 255 would fit but may look alittle bubbled depending on the tire.
Check with the tire manufacturer. For example Toyo has a chart for their RA1 tires as seen here http://www.hmsmotorsport.com/docs/To...Size_Chart.pdf. It shows the range of tire sizes suitable for specific wheel sizes.