Originally Posted by
spurious
A little bit of an update. I'm going to have to bin that calipers. In the light of day the seatpost says in faint markings under the grease - 26.4. Moral of the story, dont try measure anything with a cheap calipers after a drink
I dunno if its worth using it as it could not tolerate a .2mm difference. I'll have to measure it using a decent calipers. Perhaps i could "borrow" a micrometer from the lab
I'd recommend against trying to use an 0.2mm undersized seatpost. Maybe the pinch clamp has already been squeezed by someone else using an undersized seatpost, but you'd be better off using the right size. Since the pinch clamp may have been squeezed, you really need a bore gauge to confirm the 26.4 dimension down below the pinch area. If there's grease or crud down there, it might need to be cleaned or even honed beforehand in order to get an accurate measurement. If the clamp area is indeed squeezed, it should be possible to judiciously rehabilitate back to the correct ID.