Nice bike. I grew up racing marins of this vintage . Still got a couple . I would bet that to be a 20 inch seat tube measured bb to top of seat tube( which was how they were sized ) , with a 23inch top tube.
Good knowledge, like this. I can neither confirm nor deny right now as I can’t measure, but thanks!
@Cyclopathic started
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Nice bike.
I grew up racing marins of this vintage . Still got a couple .
I would bet that to be a 20 inch seat tube measured bb to top of seat tube( which was how they were sized ) , with a 23inch top tube.