My little brother’s new bike has this certain part stuck.

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If it is a seat post in there – spray some penetrating oil in there (gt85), leave it a bit (and pray it’s not fused in) then shake it upside down.

Although tbh it looks like there’s enough room to just put another seat post on top of it and not worry.

Try pulling it out with a steel wire with a j bend at the bottom

I don’t believe it is a seat post, please show the saddle and post that came with it. A seat post must at minimum be tapered at the top to fit the clamp and this photo doesn’t look like a post, even if dropped in upside down. This almost looks more like a misaligned bore of the seat tube after assembly that left a step. The overall quality is very low and this may not be salvageable. Walmart bikes aware notoriously poorly constructed. If posible I’d return it and try again elsewhere.

Did you try turning the bike upside down and whacking the bottom bracket with that mallet?

If there is anything in there – and I’m not confident there is from the photos – is it actually causing you a problem?

Does it stop you inserting a seat post as normal? Does it rattle?

You mean the blue part? That’s literally the frame that you put a seat post in.

You’ve got a lot of people posting on here who really don’t know what they’re talking about. Many entry level bikes come fitted with what’s known as ‘Universal’ or ‘Traditional’ style seat posts. They don’t have an integrated clamp for the saddle. [This sort of thing here](https://www.cycling2000.co.uk/components/saddles-seat-posts/kranx-straight-alloy-350mm-seatpost-in-black__10510). The clamp ([see example here](https://www.amazon.co.uk/OriGlam-Bicycle-Saddle-Seatpost-Bracket/dp/B077BRCWHC/ref=asc_df_B077BRCWHC?mcid=8df24411e7633dc38eb04c57add51aa3&tag=googshopuk-21&linkCode=df0&hvadid=697258126963&hvpos=&hvnetw=g&hvrand=14869033406061032733&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9180853&hvtargid=pla-469976162297&psc=1&gad_source=4)) is fitted separately. It’s entirely possible for one of those posts to slip into the frame.

I’m afraid OP that your best bet is going to be to remove the cranks and bottom bracket from the bike to see if you can access the bottom of the frame’s seat tube to unjam the seatpost from where it’s sat. It’s going to be a combination of spray lubricant, fiddling, and a small amount of violence to remove it. Good luck.

Dealt with this last week, just go to your lbs and buy another, not worth the effort/labor of trying to dig that out. The extra weight shouldn’t be enough to matter. You see it commonly with assemblies from “pallet/bin bikes”.

Just send it back man, it’s Walmart after all you’re not losing our much

Can try pouring icy cold water inside, wait a minute, dump it out, and pour hot water on the outside pipe all along the length. Quickly, point the pipe open end down and smack from that open end upward repeatedly with a piece of wood or soft mallet. Good luck.

The seatpost is definitely in there, everyone saying otherwise doesn’t know what they’re looking at.

Get a coat hanger, straighten it out, and put a hook at the end. Then try to hook the bottom of the seatpost with the coat hanger and pull it up. Sometimes it can help to do it with two coat hangers at the same time.

Get a tape measure and tell us how far down inside the tube it is. Then, tell us how long your intended seatpost is.

It definitely looks like the diameter is smaller, with a defined lip, just below the clamp gap. Can’t tell if it’s a stuck piece of broken seat tube, or if it’s a manufacturing defect of the bicycle frame.