Seat post is bending

[Siestabikes]

I noticed my seat post is beginning to bend on my early 80's rat rod Cruiser. What after market seat posts are a bit stronger? It's an older picture and doesnt quite show the bend

 

[Chavez]

Chromoly 13/16" bicycle seat post with 7/8" seat mounting - 400mm

Chromoly 13/16" bicycle seat post with 7/8" seat mounting - 400mm

www.porkchopbmx.com

This is what I use. I’ve bought several and they are excellent. They actually are a better fit than the original seat posts. You usually have gently open up the top of the seat mast. I think I’ve used an old seat post to gently open the frame up. Then clean the the inside of the frame where the post goes in, very lightly grease the bottom section of the post and it makes for a really strong set up.

There’s many other options out there, usually associated with vintage BMX, but I can’t speak for those because I haven’t tried them.

 

[Chavez]

Oh yeah, and you have to swap out the mounting pieces to attach it to the post, because the new post has a 7/8” top. Much easier to find parts for.

 

[kreika]

Get a longer post that goes deeper into the frame?

 

[AS-1]

Rotate the post 1/2 turn.

 

[GTs58]

Has anyone experimented with filling a seat post with polyurethane expanding foam? The high density closed cell ridged foam that's used on commercial roofs and for insulation?

 

[Rusty Klunker]

I've read that the exercise bikes have a thicker seat post but never measured any. Can usually find them under $30 on CL or marketplace or out at the curb for free.

 

[fat tire trader]

I noticed my seat post is beginning to bend on my early 80's rat rod Cruiser. What after market seat posts are a bit stronger? It's an older picture and doesnt quite show the bend

View attachment 1893228

The best ones come on Schwinn exercise bikes. They have inch markings on them.

 

[Cooper S.]

Sometimes you can find solid aluminum seatposts on eBay

 

[Schwinn Sales West]

Sometimes you can find solid aluminum seatposts on eBay

A tubular tube is stronger than a solid tube, it has twice the surface area.

Back in the day Schwinn made/sold heavy duty seat posts for "heavy duty work" on the Chicago built models. They were sold as 12 gauge. Today it would be difficult to identify and source the part. It just looks like a normal seat post.

As already mentioned, the early Chicago Built exercisers have longer and thicker "heavy duty" seat posts. They were all 13/16" diameter up until they went with the large diameter seat post that has the adjusting pin/knob going through the post. They are available at y=ard sales every Saturday morning.

John