How are you lowering it? That will affect the suspension travel you have left.

What sidewall thickness do you want? The combination of rim diameter and sidewall thickness will determine the total tire diameter.

Taking both of those numbers into account, you can figure out how much space you have inboard and outboard of the wheel mounting surface.

From there you can see what offset you can get the rims you like in and find a tire size that exists that will fit.


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