So that verbiage is being changed. What I recommend is that if you have a Cervelo with the 3T Aduro stem, the AeroBento will fit perfectly. You can use the AeroBentoX. They both work on frames that have top tube boss mounts. For BMC bikes, I don't quite understand why the boss mounts are so set back. It will work for that bike, or I think the Dark Speed works bento would be a good option for that bike as well.
The AeroBentoX has more volume and just easier to use with Di2 and cable integration.
Hans Bielat
TorHans LLC Co-Founder, Owner, Chief Innovation Officer
http://www.torhans.com