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 >>/81777/
I have the same Emonda (just later SLR model) and the integrated saddle is pretty good. You don't cut the base seatpost at all, you just insert a seat mast cap and clamp it to the frame seatpost. The seat mast caps are sold separately by Trek and should still be readily available. I'd contact some Trek store to be sure about the availability, but I don't think it's such a big concern. The aluminum one should cost under 100 euros new.