Wheel/Tire upgrade

I'm looking to put some bigger wheels on my colorado.  Anyone know the specs for the wheels.  I know the bolt pattern is 6/5.5 inch but am unsure of the offset range that is necessary.  Also does anyone know how wide the tires can be without rubbing?  Thanks for your help in advance.
Eddie

I dont know if you have 2 wheel drive or 4 but i have a 4 wheel drive and i put 18 x 8 wheels wrapped in 265/65 BFG TKO All Terrian tires and only had to turn torsion bars couple of turns to keep it from rubbing.  I left the mud flaps on that is what it was rubbing on if i would have taken them off they would have fit without any change in torsion bars.

Do you happen to know the offset on those 18s?

I really dont know they were on there when i bought the truck i just know they are 18x8s I tried to put a picture here of the wheel i dont know if it will show or not dont really know what im doing



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Here is a picture of the truck w/the wheels


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my 07 z71 4x4 is sittin on 33x11.5 BFG's on 16x8's but i have a 3" body lift id say you could fit 33's with offset torsion keys so they lvl out the front the whole 2-3" but that puts alot of wear on the front suspension.