Originally Posted by
Leinster
Ok, Paul, you're right. There's absolutely no way to record where a seatpost used to be once it has been moved. Might as well forget the whole thing and do it by guessing.
The debate isn't over whether it can or can't be done - marking the seatpost doesn't work reliably if you lower the seatpost, but you can measure the amount of exposed seatpost with a small tape measure (or cloth tape measure) like this -
A lot of times the seat post has a fixed line you can't lower it below on it like this -
If you think to yourself "someone is going to screw up my seat height", you could do it beforehand, but that doesn't change how extremely annoying it is when a bike shop moves it around when they don't need to and you didn't expect that they would. You might have paid for a fitting and not expect you will have to move it, or you might be like my mother who just likes it where it is and has no idea what the measured height is or even that it changed - just suddenly she's having knee problems and doesn't know why.