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You should get accustomed to sticking the bike's rear wheel in a corner and measuring the X/Y position of the BB and the X/Y position of the front/top of the saddle. It allows you to adjust two bikes to fit exactly the same with quite a bit of precision.
You are looking to measure "Y" as the vertical distance from the center of the BB to the top of the saddle.
X is the horizontal distance the saddle is behind the BB.
It takes all the guesswork out of the old fashioned method of measuring up the seat tube.
I think Lennard Zinn or someone has a webpage about it.
But for two bikes with the same STA this should be really easy.
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