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I think that's true.
"There was also only one size available, approximately 22in. The claim was that the frame design would accommodate riders of heights between 5ft 5in and 6ft 2in, using varying lengths of seat post and handlebar stem"
there used to be a really informative (now dead) site about Kirk bicycles. you can still access it here: https://web.archive.org/web/20180315160248/http://www.kirk-bicycles.co.uk/Kirk-History.htm
I raise you this