The bike is a Specialized Rockhopper of unknown vintage. The frame is good, even pretty, much of the rest is problematic. When you grab the crank arms there is play. So, does that mean there is a bottom bracket problem? The crankset looks problematic too. Here is a picture of the largest chain ring. Is this shot?
If I have to replace the crankset and bottom bracket, how do you determine size and whether they are compatible? I can find cheap cranksets online but they don't say what size bottom bracket they take.
I did measure the outside of the bottom bracket shell and it is 73mm.