Try finding a big one, and that aside, try finding one that’s not cracked at the head tube or seat tube.
They are about.
It was a few years ago now but I did look for a 21” one and was offered a couple neither of which were cracked. Prices were reasonable but for reasons I forget (but regret, whatever they were) I didn’t go through with it.
@Big_Ted started
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Try finding a big one, and that aside, try finding one that’s not cracked at the head tube or seat tube.