NWG, I've been meaning to mention that DH and I were recently in a Trek bike shop in Park Rapids, MN to get some chammy butter, and I was looking at the fat bikes, just for fun. I commented to the guy working in the shop that I guessed they were super heavy, and he had me pick up a carbon one. Despite the humongus tires and rims, it was amazingly light! Wow. No, I didn't even ask how much it was!