definitely not to be a smart a$$, but i think the best way to see would be to take one off and try the fit. or maybe take a tape measure out and try the clearances from the caliper housing to the inside of your existing rim and see what kind of room would be required...
Go examine your current rims, and the associated clearance to the caliper. Assuming you have 17" rims, if you have over 1.25" of clearance to the caliper, you'll most likely clear the 15" wheel. I believe only one other person has tried 15" wheels, and he was successful.
If it does, it will be VERY close, however I doubt it will fit. The 16 inch wheel doesn't fit the .8 inch larger EXT/XL/SS rotor and caliper assembly. The Colorado front disc is only 11 inches (Ours is 12 in the SWB non-SS models), which is why they can use a 15 inch wheel. If it does manage to 'just fit', the clearance will be so tight that there will be no circulation to remove heat and you risk heating the tire bead or heating up the brakes to the point of fading.....I'm not sure I would risk it. You have to question GM's thinking on using the smaller brakes on those trucks, a loaded pickup will be heavier than our SUVs and our brakes while good are not overly big or powerful for the size of the truck.
I understand the heat issue, but i have stock 17's and chrome 16x8 6x5.5 w adapters, but i wanted an extra non-chrome set and these have some nice aggressive tires for under 200, so i thought if thet would work with my 1.3 in adapters, they would be worth having.
i tried before i put my wheels on and i had no luck! i had the adapters as well to run 6x5.5 but when i went to run 15's i couldnt clear the caliper top and just caught the lower ball joint bolt! but good luck and if it works out let us know
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