Measure seatpost diameter on frame / Raleigh granada 1986 Yesterday I saved a Raleigh granada frameset from 1986. It's in ok condition but without any of the original parts.

The plan is to build it up with leftover parts. So no original restauration on this one.

I tried to figure out the seatpost diameter by measuring the hole in the frame with a calliper but I couldn't be sure it was a 27.0 seatpost. Do you know? Or are there any other more reliable way to measure?

Sorry for the bad image but that's all I got. It's just drying up after being carefully cleaned.
I ordered a 27.0mm seatpost and it fitted perfectly!