Which set did this sealed bag of mostly grey LEGO bricks come from?
As I mentioned in my comment to OP's original question, this is an inner bag of a larger set, not a full set. It is a bit hard to tell which set it could be, as the pieces are too common to narrow it down from just one image. I did look up the 3x4 hinge-plate, as that was the most uncommon, but it still appears in 45 sets: https://www.bricklink.com/catalogItemIn.asp?P=44570&amp;colorID=86&amp;in=A

Upon more careful inspection, and narrowing down the pieces even further, it appears that this is the gray/black bag from the #10702 LEGO Classic Creative Building set: https://www.bricklink.com/v2/catalog/catalogitem.page?S=10702-1#T=S&amp;O=

I came to this conclusion by verifying some of the other pieces in the set from the BrickLink Catalog, and also noticing that the 23mm D. x 7mm Offset Tread Black Tire only appears in the above mentioned LEGO Classic set from the list of 45 sets with the 3x4 hinge-plate.