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Thanks, the seatpost is embarrassing. It's a 26.8mm piece of merde that came with the frame. I wrapped the post section in black electrical tape because I wanted to have a carbon post, but I assumed (wrongly) it was 27.2mm. I'll start looking for a nicer seatpost, nicer tyres (with the logos aligned no doubt), and I need to shorten the gear cables coming out of the levers too. I will also replace the 105 cassette that came with the wheels with a Dura Ace cassette that came with the groupset.
verry clever build !!!
what is the seatpost ?