Trek seatpost enquiry someone here can answer in their sleep

torqueless

Senior Retro Guru
I have a welded Trek frame which a combination of fading memory and online research reveals likely to have been a 1989 Trek 830. I carried out a seatpostectomy on it 15 odd years ago and thereafter used a shim with a slimmer seatpost, and so never quite managed to confirm the correct diameter seatpost for the frame. 26 point something, for sure. I suspect 26.4. Can anyone confirm?
 

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