hey netsurf, are you looking to accommodate mountain bikes or road?
My lease will be up soon and I want a roof solution for my GT when it arrives in April.
I've been looking into the 1up roof rail since I currently have the hitch version on my SUV. These things are really good, fast to load and unload your bike and no straps...
1UP:
The other option is the OEM bmw bike carrier, its the same as Thule criterium)
Both solutions are awesome if you don't want to remove the front tire on your bike.
Thule Criterium / OEM BMW