15x8 wheel with 4.25 bs "biggest tire option without rub"

How about 275/60/15 on 15X8 and 4.5" backspace? anyone running this on their Barracuda?

running 295 60 d15 on my barracuda -8 1/2'' w/ 4'' offset , massaged inner fenders, stretched front edges w/ stock shape , 3/4'' offset spring hangars--these were 15x8 wheels before the chqange , caltrac springs have settled now , tires are even w/ the top of fender rim.

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