Steph Davis has photos and advice on crack climbing – particularly off-widths (which we have so many of in MN) including what type of shoes work best.
“So as with everything, offwidths are all about the feet. I have good news or bad news, depending on what size you are: the bigger your feet, the easier it will be to climb wide cracks. If you are climbing sandstone offwidths, which tend to have less small footholds and little edges, I strongly recommend you wear Five Tennies for wide cracks. It makes it way easier, and more comfortable. On granite, where you need to take advantage of anything you can get, just wear a big, stiff shoe”