Stuck Seatpost Solutions
This guide will cover what to do if your seatpost is stuck in your frame. We’ll deal with steel, aluminum, titanium, and carbon combinations.
*WARNING* This problem can be very hard to deal with, and sometimes constitues a mechanic’s worst nightmare! It can also be very easy to damage your bike while removing a stuck seatpost. Proceed at your own risk!
- PB Blaster, WD-40, or Liquid Wrench
- Coca Cola
- Allen wrench
Let’s start with the basic method:
Loosen the seatpost clamp, then pull out the seatpost! If that doesn’t work, you can try spraying it with WD-40 or Liquid Wrench, waiting, and trying again.
If necessary, twist the seat side to side as you pull the post out. Hopefully that works… Just try not to scrape the post too much.
Steel seatpost in a steel frame:
When you’re working with steel, there is usually one culprit – rust. Your best bet here is the WD-40 or a stronger penetrating oil. That should dissolve the rust and free the seatpost.
Aluminum seatpost in a steel or aluminum frame:
There is a common problem here too – corrosion. There are a few things to try in this case. First, ammonia. But if you don’t have any, you could actually try Coca Cola, because that stuff is surprisingly powerful!
Some twisting will probably be required though, at least to help the liquid work its way down along the seatpost.
Carbon seatpost in an aluminum frame:
This is just about the same as last time. The only difference is that you should NOT use powerful solvents (such as paint thinner) when working with a carbon post. Oil, grease, and Coca Cola are fine.
However, if you have to twist a carbon seatpost to get it loose, and you get deep gouges in it… replace the post.