Can the frame rotate around the BB with that? It makes a lot more sense from a weight distribution point of view, but I couldn't see a happy way of it not smacking the down tube or chain stays if it's span by accident.
No, it can't. I keep meaning to modify it and make a more stable base, but other things always get in the way.
Boring stuff always gets left until it's critical ;)
@Brommers started
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Can the frame rotate around the BB with that? It makes a lot more sense from a weight distribution point of view, but I couldn't see a happy way of it not smacking the down tube or chain stays if it's span by accident.