[Brompton] Ready-to-use seatpost sleeve?
 

Hello,

The seatpost on my 2014 Brompton kept slipping, so I removed it with flat screwdriver + hammer, and then tried the cheap "Aceoffix Seatpost Sleeve"… which is crap — it won't work with Brompton's saddle height insert, and I could push the seat down just by hand.

Before I make an appointment with a Brompton shop to have the original QSTSLV installed, do you know of an alternative sleeve that works well out of the box, ie. with no need for a reamer and special glue?

I saw Makerick3D's recommended, but it's not worth it considering it's €35 before shipping from Singapore and possibly VAT in Europe.

Thank you.

https://cimg8.ibsrv.net/gimg/bikefor...3be0df9c2a.png

I’ve found that sanding the seat posts with 80 or 100 grit sandpaper roughens it up enough to prevent it from slipping easily, I take the seat post, with the seat attached, and then grip the lower part with the sand paper, and turn the post in circles. A little cleaning in the seat post tub using a small steel brush gives a clean surface, and helps prevent slipping. Another, low cost option would be a second seat post clamp mounted on the post just above the seat tube.

Thanks for the ideas, I tried both before.

Sandpapering the end of the post didn't work, and I'd have to find a way to enlarge the clamp just a bit since the one I got doesn't slide easily so it'd be a bit of a pain to use (although it's a simple solution that doesn't affect the seat post).

I'll confirm after a ride, but with the cheap Aceofix sleeve, it looks like 1) a single layer of… duct tape (two is too much) on the outside, 2) double-side tape added to hold the sleeve in place, and 3) slight tightening of the Brompton clamp does the job: The post slides up/down as before, and the seat stays up even while pushing down hard. It's literally a sub-millimeter job.

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Edit: Nope, kept sliding. Even worse than with the original, used Brompton sleeve.

Until I get an appointment with an experienced Brompton bike shop (a reamer is required), an extra 31,8mm clamp does the job. I had to file it down because it had a ~0,5mm edge on its inner ring.

The Nov Design from Korea work well for me.
I used this and no more slip.
You may google Nov Design seatpost sleeve to find out.

Thanks. I have an appointment next week to have it replaced + reamed at a Brompton dealership.

https://brilliantbikes.co.uk/brompto...lar-sleve.html
https://www.808cycles.com/product/nov-seatpost-sleeve/

Turns out it was a worn quick release seat clamp, not the sleeve. A new one solved the problem, and works even with the cheap sleeve from AliExpress.

In the meantime, a second clamp on top of the main clamp works fine.

If the sleeve does need to be replaced, I woudn't recommend Acceofix's, as it's incompatible with Brompton's very convenient saddle height insert — you can always get one, and file/cut it if its height and vertical opening don't match Brompton's.

https://cimg8.ibsrv.net/gimg/bikefor...8dada03cbf.png

https://cimg4.ibsrv.net/gimg/bikefor...45ef90e5e8.png


Things to check: