Mini tubbing, springs and backspacing

Just get the right size rims.I have 15x7(i think)ralleys,there custom made by somebody,small bolt pattern.Anyway,i have 255/70/15s on them,and i have 1/2 inch clearance from the wheel lip and a good 1 inch clearance between the springs and the tire.I havent measured the rims,because the tires were already mounted when i got them.

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