Rubbing will depend a lot on the offset. 13.50 is a wide tire, so you will likely get some contact with the control arms and the plastic part of the inner fender. That can be easily solved with some careful trimming. I cut probably a good 4" off of mine front and rear and it still looks factory. Why do you want 20's? The ride will be a lot rougher especially with a 33" tire, not to mention the much higher cost of tires in that size. I personally like the way it looks right now, you just need a set of flares to keep rocks off your paint and the cars behind you.
Why u going with a shorter tire? And not sticking with a 35? As far as rubbing if it's a 33 and it's a little wider I don't think it will rub. But like I said in other posts. When it comes to rubbing it all depends on the BS of ur rim. When u can understand how that works u. CAn compare new rims with ur current rims just by turning ur wheels and look how close the current tires are from rubbing anything. Hope that didn't confuse ya
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