I got off on a YouTube tangent this weekend and ended up watching Olympic weightlifting. They have weights that are all the same diameter. They are just narrower. However, I couldn't tell if the lightest plates (i.e. the only ones I'm probably using) were also the same diameter or not.
BTW, it blows my mind that people are strong enough to lift using a bar similar to the one I use and have it flex. That's just craziness.
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