Please help me, I’m so lost.

[R.Duff]

You could almost certainly go up to a 285, and maybe a 295, and still clear the UCA.

285 would still have you 2mm further from the UCA than stock (19 - 12 - 10/2). 295 would put 3mm closer.

This is assuming UCA clearance is the limiting factor, and ignores tire height.

Yeah was mostly for getting Carli control arms or icons and fox shocks they say it's better to have 4.5 backspace but we'll see. Bought my rims before they had the space specs out. Thanks though