I can see how forks would need to be heavier because of the higher moment of canti mounts vs road caliper mounts. But frames? Is the stress on a frame greater jumping a cx barrier than it is bunny hopping curbs or hitting road potholes? I think not much. Top road frames are in the 700g range right now with weight limits around 110kg. I'd like to see at least a 900g cross frame with a weight limit of 100kg.