Click the first link image and zoom in for an amazing close-up of the rover.
https://c2.staticflickr.com/2/1726/42803757572_dec6a9f80f_o.jpg
Here's a different angle on the wheel..
https://www.cnet.com/news/hole-y-wheels-curiosity-mars-close-up-shows-cracks-in-rovers-rollers/