I don't remember much about the story or any of the character's names. The story took place on a space station, and vaguely remember that the space station was a multi-ringed structure. I do remember a scene where the hero was being tested about various gravity levels, and was in an elevator which went to various levels of the space station. He flexed his knees at one level to determine where he was on the station.
I read the book when I was a child, back in the mid to late 1970's. It was a hand-me down book from one of my uncles, so I don't believe that there was any dust-jacket on the cover, which all I remember was plain. The hero was definitely a male, I believe Caucasion. I had been updating my list of books in goodreads and the memory of the scene just jumped out at me. Perhaps Clarke, but the only things I distinctly remember reading of his was 2001, 2010, Dolphin Island, and later, the Cradle. This book felt like old Disney Tomorrow Land / Robby the Robot era sci-fi.