SSCX Only!

it's not that low though...

Boone is 70-65 mm depending on size... http://www.trekbikes.com/dk/da/bikes/road/cyclocross/boone/boone_frameset/#

edit: I have 290 mm from the ground to center bb. That should be more than enough for any cxcourse I will ever encounter

The difference in BB drop in the sizing is also mainly due to the cranks length.

70mm likely to have 170mm cranks, whether the biggest one that have 65mm drop have 175mm.