My apologies on that, my small brain thought it was figured out and missed one detail. My main focus was that the 2008 street tandem and 2009 street tandem use what seems to be entirely different bases. 2008 is MTB based where the 2009 is more road based.
Now I really question some of this as when I place the 2009 Street Tandem and Road Tandem geometry charts side by side, all numbers are identical except headtube angle.
How can it be possible to have two different head angles, while having identical fork rake, trail and wheelbase?
Something is crazy somewhere, maybe it's me.
PK
I suspect the charts are wrong, which is not unusual in my experience. I suspect the street would have a longer front center, longer wheelbase, and different trail. Not that it matters, but the brake mounts would be located in a different place, so the forks may also be different in height or rake.