It depends on the actual inspection of course .
On my last two GM pickups I replaced the original OEM tires with a next higher size Michelin Highway tire .
I have 60,000 miles on my current 265/75R16 load range E Michelins .
I was going to replace them last summer but they were still not close enough to the wear bars .
In October I switched over to my studded cooper snow tires which are mounted on the factory gm aluminum wheels .
Each summer I pile on the miles towing my boat , doing other outdoor stuff , and towing my TT .
Summer tires are not critical for tread traction in Central Oregon because we get no more than 2 inches of rain from May to October .
My winter tires are replaced when there is still 3 /16" left for snow traction .
I am not afraid to use my 60,000 mile Michelin summer tires down to the wear bars , because there is no signs of cracking .
Another consideration is that my 265 are load rated 3415 # each and the oem 245 were rated 3042 # each .
My truck weighs 6800 # running around and about 8300# fully loaded when towing my TT .
So it depends on what kinds of loads you carry , the weight rating of your tires , and the close inspection for cracking and other imperfections .