Re: 4x4 suburban wheel offsets
Those are probably 15x7, factory aluminum wheels. The steel wheel variation is 15x8.
I couldn't get Discount tire to mount 33x12.5's on the 15x7 aluminums so if you are going bigger, than changing out the rims are a good idea too.
Sorry, don't know the offset or backspacing off hand.
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- Jeff
89' K5 Blazer, 2.5" lift, 35" tires 
04' GMC Yukon XL, 3/4 ton, 8.1L
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