Demon rear tire/wheel combo question??

I run M/T drag radials. 275/60/15 on a 15x8 wheel 4.5"BS . I moved my springs in 3/4" as well tons of room. Another local duster brother, ran 15x10 with 5.5" BS with 28x10.5x15 slicks. thats the max fit in stock wheel well.

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