255/45/17 is a good upgrade for ZQ8's.

 

I ran 255/45/17's on my stock ZQ8's for nearly 2 years without any problems and no rubbing. Personally I probably wouldn't go any wider than a 255, any wider and it's just for looks as you're not really getting any more rubber onto the road with a street tire.

From what I've seen the most common sizes people seem to run on the ZQ8's are:
235/50/17's (stock)
235/55/17 (~ 1" taller, stock width)
245/45/17 (~1/2" shorter, 1/2" wider)
255/45/17 (~1/4" shorter, 1" wider)
255/50/17 (~1" taller, 1" wider)

 

I plan on running 255/50/17's on my truck if I find a set of wheels. that way the tires will be the same height as my z85 stock tires.

 

i run 255/45 and have no problems whats so ever

 

just put the nitto 555 extremes 255/45-17 and they look awesome and they feel so good wow now i know why people say continentals suck btw i had no rubbing

 

thanks for the info guys, though i never really had any complaints about my continentals, ive got 57k on the originals and i thought they drove nicely. but ill have to check out the nitto's my buddy has a set on this silvy with 20's and they grip reall nice

 

I am running 225/55/r17 in michigan and that is good for me... Saves me from some potholes

 

my contis were good also but wait till you get sum good good tires it feels like a new truck i was driving at over 110 and is was smooth crusing at 100 feels like im driving at 55