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Hey, although my wheels are 19s my rears are also 11 -1. I'm running 255/35 and they clear perfectly fine. You might want to go with 255/30 since you're on 20s just to sit a bit lower, but that's up to you. Also, my rears are just rolled flat and has the naturally pull that comes with a flat roll. I'm currently running -8 camber in order to clear the wheels. A bit much for my liking but I'd rather not pull the fenders. Hope this helps.