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I'm first trying to remove a stuck seat post through brute force. I've removed the wheels, fork, and chain so that it can more easily be worked with upside down.

I began to turn the frame in a direction while the saddle was lodged in between something strong. After spinning the frame so many times, I noticed the gap (between the red lines) becoming bigger (than what is pictured). So then I spun it in the opposite direction to close the gap; how it was before I began all of this. Now, the gap doesn't seem to close anymore and I can spin the frame indefinitely—behaving similar to like a thread-stripped screw.

My belief is that I originally spun against the direction I was intending for, and now I'm spinning in the intended direction but endlessly. If the gap closes then hopefully I can try to loosen the seat post.

Frame is chromoly, I think the post is aluminum.

What do you think is going on here and how do we remedy it?

Disclaimer, I'm not concerned about damaging the seat post or the saddle (obviously). I ultimately just want to install the new water bottle cage that hugs onto the seat post.

stuck seat post

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    Have you tried tapping upwards on the underside with a hammer, while holding the frame down with your foot ?
    – Criggie
    May 18 at 19:51
  • No, I can't really picture what you're describing @Criggie. But evidently that component isn't threaded after all. I just popped it out completely by standing on the saddle and twisting pulling with the frame upside down. I guess it just need to be hammered back into place? I'll worry about the stuck post another day because now I can slide on the new bottle cage ...
    – m_antis
    May 18 at 20:00
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    @m_antis: Your seatpost is dead. For integrity reasons, don't just hammer it back. You still have to get the remaining bit of the seatpost out of the seattube and get a new seatpost. Losing the saddle together with its clamp on a ride may gravely damage some precious parts of your anatomy.
    – Carel
    May 18 at 20:15
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    @Carel are you saying that once the post and saddle clamp are separated, they cannot be safely coupled again?
    – m_antis
    May 18 at 21:15
  • @m_antis: So it is. They are either bonded by some thermic procedure (head cold/tube hot) or glue for carbon tubes and metal heads. It's a highly stressed bond, don't attempt repair.
    – Carel
    May 19 at 8:38
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It may be a silly question from my side: Did you loosen the bolt on the seatpost clamp (the one above the blue tape)?

The saddle clamp isn't screwed in but either shrunk-fit or glued in place. So your seatpost is toast. Removing a stuck post is a classic problem. It can be very hard, if the post hasn't been taken out for a long time and put back with a liberal coat of grease, anti-seize paste or carbon compound if either post or tube, or both are made of carbon.

To remove the post, try first with penetrating oil and letting it soak for plenty of time. If you can rely on a mate to hold the frame grip the post with a water pump wrench. Be careful though not to damage your frame.

On YouTube in bicycle dedicated channels you may find several more methods to proceed as it is quite a common problem.

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    The seatpost clamp is actually under the blue tape to keep it in place from getting in the way while tinkering. What you're seeing there is actually the remainder of the water bottle rack that clamped around the post.
    – m_antis
    May 18 at 21:06

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