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Bumpstop And Tape

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If the closest thing that will hit is 6 inches away and you know the suspension will move up 4 inches before full compression (bumpstop bottomed out completely), you have roughly 2 inches of clearance. So double that and you've found your new tire size. You could probably add 4 inches of diameter to your tires max-but err on the short side, maybe plus 3 inches. Or get out the Sawzall and start chopping.