Originally Posted by
Camplex
I wouldn't use a file, but a marker or pen of some type. Maybe the wife and you can have different colors. These would wash off with ISO but otherwise wouldn't smudge.
Sakae made a seatpost back in the day that had reference measurements on each side, cm and inches. You could easily switch back and forth. There is one on eBay right now but its a 26.8mm....
Originally Posted by
Leebo
Got a black permanent sharpie?
Seatposts should be lubed with grease. I don't think markers would hold up to grease very well.