[speedfan]

I am using a 74 Schwinn Continential to build a single. Is there a source for a seatpost that will allow a modern seat clamp ? The tube is about 20.8 mm ID

 

[hophead]

I am using a 74 Schwinn Continential to build a single. Is there a source for a seatpost that will allow a modern seat clamp ? The tube is about 20.8 mm ID

I'm not sure that I understand your question. Doesn't your Schwinn have a seatpost clamp built into the frame?

 

[speedfan]

seatpost

In the frame yes. I am trying to use a modern seat, must have a "seatpost" that will fit in the frame and clamp to a modern seat.

 

[hophead]

In the frame yes. I am trying to use a modern seat, must have a "seatpost" that will fit in the frame and clamp to a modern seat.

I think I know what you are trying to do. The seatpost you have is like the one on the right and you want to switch to the kind on the left?

If so, all you have to do is get a seatpost of the same diameter and a new saddle and you are in business.

 

[speedfan]

Correct, but can not find a post with the small diameter needed to fit my frame. I will probably have to have an adapter turned at a machine shop. Fit it inside the new post, not in a hurry, still looking.

 

[speedfan]

Thanks for the attention, this has been a fun project. Still learning the details of the single culture.

 

[hophead]

Correct, but can not find a post with the small diameter needed to fit my frame. I will probably have to have an adapter turned at a machine shop. Fit it inside the new post, not in a hurry, still looking.

20.8 is definitely an odd ball size. I have an old Schwinn singlespeed conversion myself. Good luck!

 

[photosbymark]

Just an idea and its really a fairly high risk one if what you have already is working. IF you have access to someone that is a really good welder, why not remove or just cut the top off the seat post you have that will work, and then cut the mount off the type you want and then have the welder put them together?

 

[hophead]

Just an idea and its really a fairly high risk one if what you have already is working. IF you have access to someone that is a really good welder, why not remove or just cut the top off the seat post you have that will work, and then cut the mount off the type you want and then have the welder put them together?

Modern seatposts are aluminum and the OP's is probably steel, so welding is not possible.

 

[TxCyclist]

There is no welding equivalent for aluminum?

 

[hophead]

There is no welding equivalent for aluminum?

You can weld aluminum and you can weld steel, but you can't weld aluminum to steel.

 

[hophead]

After a little research on the interweb, your bike uses a 21.15mm or 13/16" seatpost. Schwinn never used a 20.8mm, nor did any other manufacturer that I could find. It's still gonna be a hard one to track down with a modern style saddle interface if it exists at all.

You may not need a new seatpost at all. Maybe just one of these....

 

[speedfan]

Welding aluminum

I am going to have the machine shop press the old into the new. I have to get proper length and cut new post. Will post pics after complete, thanks for the suggestions.

 

[speedfan]

Post top

Where did you find this device, looks perfect?

 

[hophead]

Here: Brooks Parts and Accessories at www.wallbike.com

Unfortunately, They are out of stock. The saddle clamp pictured above is made by Ideale. Brooks makes them too.

 

[wild]

I think you might find one of them a a used bike place that fixes up oldys but goodys. :thumbsup:

 

[WesleyJack]

schwinn post size.

I have that same bike, the post is a 13/16" post, very skinny little bugger, but this is a supper easy fix. Using about $5 seat guts from your LBS and a $4 Wald seat post that is 13/16" with a bubble to 7/8" you can put any modern seat on this pretty much.

Amazon.com: Wald 940-10 1/2 Seat Post 13/16 To 7/8-Inch X 10.5-Inch Steel: Sports & Outdoors

thats the post.