What is the largest (thickest sidewall) that will fit on the 20" XSP Enkei wheels?

Did some searchin' on here but couldn't find the answer I was looking for so I figured I'd ask. I have an 09 XSP with the 20 inch rims and the tires are really wimpy looking. What is the largest size tire that I can go with with no problems. On discounttire.com they suggest the sizes you can use and they offer a 285/50R20. Would that fit without a problem? Rim may be too small though. Current tire's are Micheline Lattitude Tour HP's 255/50R20.

 

Nevermind...I just found my answer. 275/55R20.

 

Ok, just for anyone getting larger tires with their 20" wheels...I just put Falken Ziex tires in 275/55 R20's on My 09 X-SP DC and they look awesome. They don't look ridiculous like the small tires that come on the 20's from Toyota. However, they do rub a little bit here and there but nothing major. Also, the funny thing is is that my speedo, based on my GPS, is dead on! I don't see how but at 50, 60, and 70 mph the speed is dead on. I was concerned about that being an issue, but not any more.

Hope this helps some of you guys looking to make your truck look less ghetto, as someone on here called the 20's.

 

Pics?

 

Here ya go.

 

By any chance do you know the offset or backspacing on the wheels?