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@Loop
On One Slot Dropout Inbred?
They're designed to be run with a full 400mm seatpost but frame sizes go up to 20 inches and they have a longer toptube than usual XC geometry.
As far as I am aware On One have a really good reputation but perhaps there is someone on the forum who can tell you their first hand experience.
Here's one they made earlier:
Hope this helps.