Rocky could fight at heavyweight if he wanted to I mean he did & the rules back then weren't very different from the ones now, it's just he wasn't fighting big fighters he was fighting other smaller heavyweights. There's only a limit on how much you can weigh up to Cruiserweight or back then Light heavyweight and since Rocky was over 175 he was a heavyweight. The creation of the cruiserweight division has basically created a "Super Heavyweight division" out of the heavyweight division
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