bdi121

The permanent ink mark on my folder seat post doesn't last long. Do you have any suggestion ?

Cfd

Electrical tape stretched around the circumference of the seatpost (where it meets the frame) works well as a marker.

fmattheus

I have a rear light bracket fixed at that height. Doesn't work if your fold requires sliding the seatpost into the seat tube, though ...

PDR

What type of folding bike do you have?
With my Brompton I marked my preferred seat height with a marker pen. I then measured the distance between my mark and fully extended. I then cut a piece of heavy duty motorcycle tank protection film https://www.hein-gericke.co.uk/shop/p...oducts_id/7274 lowered the seat post and wrapped it around the bottom of the seat post. Now the seat will stop at the correct height every time you pull it up. Film has been on for 3 months now with no sign of wear.

Works really well, can easily be removed if required and is virtually invisible. I'm also using it on other parts of my Brompton to protect the frame.

Bacciagalupe

I just re-apply the marker.

If you are sure it's in the right spot, you could look into a small etcher / engraver. A shallow notch should not harm the integrity of the seatpost.

JugglerDave

Through experience I have found that the optimum seat height is "two fingers" shorter than my belt when standing next to the bike; it is easy to raise to that level quickly and (semi) accurately.

vmaniqui

on my post i drill a small spot just enough to make a hole but not all the way and then i mark the hole with a permanent pen. that way even if you slide it in and out a thousand times it will not smudge.

vmaniqui

what if you're wearing a heal......(ha, ha, ha, ha) or if you're wearing different shoes with different height.

itsajustme

Good point. Most folders actually fold smaller if you remove the seat post anyway.

Then it still works because a thicker sole warrants a higher seat.

yangmusa

This used to be such a pain with my Xootr. My Birdy came with a marked seatpost, it's fantastic! Why every manufacturer can't supply this, I don't know...

Paul Braithwait

I just use a ball-point pen to mark the seatpost on my Xootr Swift and it lasts for a long time. No big deal to re-apply it when needed.

folder fanatic

With different folding bikes and different wheel sizes, I use a similar approuch to yours. The only difference is the means I use by matching my hip bone to my saddle's side to determine if the saddle is at the correct height for me.

Strange, but true.

Darth_Firebolt

i use a zip tie on my MTB, but i take the seat completely off the bike when i need to put it in my car.
i have scratched a mark on a seatpost with a key before, too.

wahoonc

Scratched a mark with a hack saw blade only problem is I use that seatpost and saddle combo on two different bikes and the measurements are slightly different.

Aaron

owenfinn

Pencil - on my silver Dahon seatpost. Mark can still be read fairly easily(except at night) after a year.

Bop

+1 Works every time.

vmaniqui- "or if you're wearing different shoes with different height." It still works. The different shoes change your height on the pedals as well.

bicycleflyer

steel hose clamp....available at any auto parts store.

msincredible

Birdy seatpost comes pre-marked.

bdi121

I have a Brompton and will certainly try your trick.

Hack-saw making sound very simple and effective. I wonder if rust will set in later ?

Pocko

I tap a little dot with a center punch. I do it at the back of the seat post so I know where to find it.

I used to do it with a hacksaw blade too... until I started trying different saddles and then I ended up with a lot of marks that made the post look ugly.

Pre-marked posts would be my preference, but some people don't like those either...

.

wahoonc

Not on an alloy post..

Aaron

bdi121

Aaron, why not on an alloy post ? Not that it make any difference because my seat post is steel.

PDR

The advantage of my idea is that it does not cause any damage and you don’t have to look at the seat post... just pull it all the way up and close the clamp. Great for dark nights.
Here is a photo of the film on the end of my titanium seatpost:

wahoonc

Alloy posts don't rust. FWIW I have a couple of chrome steel posts too, those I just put a small scratch on it. I also grease my seat posts to keep them sliding properly. Both of my folders are old Raleighs one is the Compact RSW (16" wheel) the other is a Twenty.

Aaron

Foldable Two

Just use a small file and make a small (1/4" long) mark. If yo have two bikes, mark the height for one on the front of the post and he other on the back.

The Thudbuster seat posts are great because they have a nice, clear scale on them. I have written the proper height numbers on my tool board just below the serial numbers of all my bikes.

Good quality seat posts are usually not "rustable", to invent a word.

Lou