i got an awesome deal on some HRE's but they are 19x8.5 wide... non staggered... for the money im getting them for, they are better than nothing... i was wondering what would be the best tire size to put on them...
i kinda dont want to lose the 255 tires that come stock... i dont want to down size...

 

all depends on the offsets. if the rears are as wide are the front, and the offsets are the same then your wheels will not be flush and look kinda off.

you can run them but spacers might be required in the rear to make them look right. you can run 235/35 front and 255/35 rear even though both front and rears are 8.5 wide.

 

i ran 245/35/19 when i had 19"s they worked out nice.