shoot up or shut up.
Join Date: Nov 2003
Location: colorado springs, co
Bikes: yes please.
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bianchi's site has all the spec's you probably need, including standover.
you can look at each year back to '04. just change the year in the url. the geometry is the still the same every year, but each year shows more or less measurements than other years... for instance, 08 is the only year that shows the bb drop to be 68mm, but it doesn't list the head tube angle... which is listed on 07's page.
the bb height is more what is going to determine if a bike fits larger for it's size... standard road bb drop is typically 70mm, so that bianchi will fit you more like your road bike should. my ridley crosswind has a bb drop of 57, which makes the standover taller.
i'd go with a bianchi that is the same size as your road bike. i think the 52 would be way too small if you're used to a 55, plus i don't really buy into the idea of getting a cross frame that is smaller than your road bike. if you do, you'll probably be cursed with the bars not being high enough.
i was strongly considering a bianchi, until i came across my crosswind, so i spent a lot of time obsessing over the bianchi geometry.
you can really dork out by entering in all the data here: http://www.bikeforest.com/CAD/bikeCAD.php
perhaps build your road bike and your prospective new cross bike and compare.