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http://www.veloriders.co.uk/phpBB2/viewforum.php?f=3 might be worth a go too
Thanks for that, one I didn't know.
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It gets a bit confusing when you get into effective seat-tube height on compact frames.
Like I said before, the seat-tube measurement is sort of irrelevant.. I actually remember reading a comment from Robert Millar to the effect that he just used to supply his set-back and seat-height to his supplier. I reckon that although the seat-tube length will have an impact on how rigid the rear triangles are (smaller = more rigid), the top-tube length has a much greater impact on the ride.
+1.
That's why my intuitive method of measuring from lowest pedal rotation to top of saddle works for the seat tube for me. -
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Everyone has already given a lot of admirable advice, and I have learnt also whilst reading the replies. I'd just like to add that a) it is not always easy to translate the manufacturers scale diagrams to the actuality of the frame, and b) manufacturer's standard method of sizing the Seat Tube, for example vary. As a corollary to this, I can verify that a 54cm seat tube sized BMC, Cervelo and Pinarello are entirely different dimensionally when tested in riding. I've not tried Cinelli, as there are no distributors nearby.

I
Just to say that my sole complaint was that there was a notice in my face saying do not take bikes into the shop. I find that ridiculous if you want to show the staff what the problem is, If it was a cubicle OK.The fact that the staff ignored me I was not remotely concerned about although there are those who open the door and invite you in. No wish for OK status.