My seat on my bmx turns literally on every bump. If I tap it it'll turn and normally fall off.. The teeth on the seat look to be fairly worn. enter image description here I don't really want to spend any money as it's just a bike for riding dirt jumps. I was thinking of glueing it but is there any other way? Cheers :)

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  • I can't make out what part of the seat that is. Perhaps some additional pictures ... Sep 7, 2015 at 1:29
  • Added some more now.
    – Mitch
    Sep 7, 2015 at 1:32
  • 3
    You've broken your seatpost. You need to remove the part of the tube in bike with a pair of vice grips or something and then put the saddle on a new seatpost.
    – Batman
    Sep 7, 2015 at 1:33
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    It would appear that your steatpost is a cast part and a tube, sort of swaged together (supposedly permanently), and the two have separated. One could conceivably drill a hole through the sides of both and install a bolt through the hole. Otherwise the post would need to be replaced, and it may be hard to find another that would mate with that seat. Sep 7, 2015 at 1:36
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    You could try epoxy, after wire-brushing the pieces and washing with detergent to remove any oils. Do be careful to not get any glue down into the seat tube (that the tube part of the seat post fits into). That would just make a bad situation worse. Sep 7, 2015 at 1:45

3 Answers 3


Slap some JB Weld on that stub and shove it in the post. Let it sit for one day. Smack it around a little and if it doesn't pop off you'll be good to go.


Its not exactly clear on what materials are involved. It looks like the top piece was designed with an interference fit, and pressed into the tube. I'm guessing aluminum (or is that zinc?) top piece and steel tube? It's possible to braze dissimilar materials together, but it takes some significant prep work. ($$$)

If it's aluminum to aluminum, it would be possible to TIG weld the two together. You could save some costs by removing ALL the paint from both parts within two inches of the joint before bring them to the welder. Obviously you'd have to remove the seat from the mount, and the tube from the bike frame first.

Have you talked to folks who do welding repairs? It may cost a lot less than you think. I know of one welder whose motto is "Tricycles and kitchen chairs have always been free..."

  • my dad knows how to weld so I'll have a talk to him about it and see if he thinks it would work.. I may just get a new seat post if all else fails.
    – Mitch
    Sep 8, 2015 at 4:18

Your not going to find a replacement seatpost that works with the seat.

It may be worth trying to glue it together, but that will only work for any length of time if you prepare the surfaces properly. You'll need to use a wire brush to get down to bare metal. The the seat half you can use a wire wheel in an electric drill or Dremel, the inside of the seat post will be more challenging as you'll need a narrow brush and will have to do it by hand. The surfaces will also need to be cleaned with a solvent.

You could easily spend more money on tools and materials than on a new cheap seatpost and seat. Find out if you have a bike cooperative near where you live that refurbishes old bikes. They are often a good source of cheap parts.

  • I really hope the poor guy isn't still trying to fix his seatpost after 4 years ;-)
    – Andy P
    Jul 5, 2019 at 14:57
  • Argenti, it appears to be a "pivotal" seat and post, which are sometimes used on BMX bikes. Replacement posts should be available. Jul 5, 2019 at 18:16

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