Your seat post is bent ;)
luls. Wanted one of these for ages for my other bike because I can never get the saddle back far enough without it tilting down, but the seat tube diameter is weird (26mm)
@J0nathan started
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luls. Wanted one of these for ages for my other bike because I can never get the saddle back far enough without it tilting down, but the seat tube diameter is weird (26mm)