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@Regal
There's a thread on the Bob Jackson Vigorelli here including quite a bit of chat about the sizing.
Tl;dr: send them an email and they'll answer your sizing questions.
I was told that the standover height on a 23" is 33.5" and for a 23.5" it is 34". So I would assume that the standover for a 22.5" frame would be around 33".