you would have to have ground control coil overs to get 20 under there b/c the gc kit eliminated the huge stock spring perch. you would be rubbing it otherwise. as for a tire Nitto makes a 245/35 and it is 26.69" tall compared to a 23.5" stock wheel
i think a 20" rim is already a bigger diameter then the stock rims and tires combined. so unless you put something smaller then a rubber band on there, it wont be accurate. but who gives a damn. just keep up with traffic
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