I used these bearings in a very unconventional way - - as a cap for a set of custom made highway bars for an older classic motorcycle. They worked perfectly being extremely well constructed. When leaning in a turn instead of the bars scraping the street they now roll. Works better than expected even. If I had had these bearings back when I was a kid building go-carts (about 100 years ago) I would have been in heaven. I think they're great. They are heavy but also solid so that's okay. I feel no play in these bearings. They are tight and smooth like a bearing should be.