Originally Posted by
martinus
Yeah, I'll take a shot at it ... you found & posted a pic of the 48cm one... then a few of the 53cm ones.
Its an optical illusion ... look at the head tubes with the shifters on them, also the space between thereat wheel and chainring ...
There are only 2 sizes available. Most people are over 5 ft tall... so, there are more 53cm bikes out there AKA the "very short wheelbase" ones.
http://www.bikesdirect.com/products/...geo_chart.html
The bigger(taller) is has longer wheelbase.
This is a few months ago, but I can answer this question to clear this up. The first pic is one of the Bikes direct 1 offs that had the 451 size wheels. the first post on this page of the thread has pics of 2 of them. That explains the differing geometry.