Slicks 28x11.5 on 4" back spacing fitment/rubbing?

[87GN 98GTP]

So the rims now are a 4" back spacing and round an inch of clearance from the fender lip which I rolled. So my question is with slicks instead of tires and lower air pressure in the slicks will it be ok and not rub. Anyone with that size slick and back spacing please chim in


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[87GN 98GTP]

Sorry current rims are 4.5 back spacing


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