Hi Kevin, I realize this is an old thread, but I was wondering if you still have this Merlin bike. If so, can you please provide more details as to model and year?Steve I have a small Merlin titanium XLM mountain bike frame,it is currently built up as a road/gravel bike but accepts 26” mtb and 700c road wheels,it is my wifes bike and the seat tube measures 14” from bottom bracket centre to the top of the seat tube,The actual top tube length from head tube centre to the seat tube top is 21” I can send you some pics by pm if you think it might be of use.
Kevin