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Home > Bike Repair > Cockpit

Difficulty:
3-5 star rating

Stuck Seatpost Solutions

by Levi Bloom

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!

Tools:

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.

 

The tools for this repair can be purchased at:

Performance Bike, REI, or eBay.

#1 Top-Rated Repair Stand www.REI.com
With a 4.3 star user rating, the Feedback Sports Mechanic Stand is high-quality at a value price.

#1 Cyclist ID www.RoadID.com
Personal ID for long-distance cyclists - fits on your wrist and weighs nothing.

Bicycle Repair Stands www.REI.com
Wide selection of bike tools and repair stands from Park, Lezyne, Pedro's, and more.

Tools and Workstands www.PerformanceBike.com
Excellent selection of quality bike tools and workstands from all the top brands.

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