I agree that top tube measurement is important, but don't ignore seat tube angle. Many manufacturers when they shorten the top tube, steepen the seat tube, but that effectively lengthens the reach, assuming you need to then jack your saddle further back to get the same KOP meausrement. So, when you compare TTs, be sure to add 1cm for each degree increase in STA to get a comparison of reach. Another thing to watch for is very slack head tube angles. This eliminates toe clip overlap, but makes the bike super stable. The trails on many small womens frames are in excess of 6 which is too stable for my liking, but YMMV.




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