Join Date: Jun 2005
Location: Silver Spring, MD (MABRA/MAC)
Bikes: Cannondale Cyclocross, Specialized Langster, Giant TCR-C2 Composite
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Wow, you know your numbers pretty well. It probably means that you know your place on a bike as well, too, and your body would be sensative to an improperly-sized bike. The best thing to do is to purchase your bike from a shop that does custom fittings. I did this with my Cannondale Cyclocross, and the bike fits like a glove. In fact, I don't experience any of the discomforts that I did when I fumbled with the fittings of my old bikes over many years.
Even though you have the numbers dialed in for the top tube and the standover height, all of it becomes irrelevant if the handlebar is at the wrong height or length and the seat is at the wrong hieght and fore/aft position. Bikes today are very moldable to the rider. This is important because as a MTBer, chances are you are out of the saddle most of the time and all over your bike coaxing it thru technical singletrak. On your 'cross bike, and more so when it's on the road, you will be in the saddle more and your body will be seeking a position of comfort rather than a position of functionality.
Good luck and enjoy your 'cross bike.