Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-16-10, 10:25 AM   #1
stien
neits
Thread Starter
 
stien's Avatar
 
Join Date: Apr 2010
Location: Cape Cod, MA
Bikes:
Posts: 1,664
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Oh wise folk of the C&V forum, help me with old French seatpost woes!

Update: I have a 25.4 mm seatpost, but need to open up the top of the seat tube.

So someone paid me to take this frame (basically, I bought a bike from them and they threw in the frame. I sold the bike for more). Anyway, I wouldn't have paid for this frame.



It's rusty, it's dusty, the bottom bracket was basically mud, it's missing the fricken seatpost top clamp, and on top of that, the nut to clamp the seatpost into the frame is round.

Well I don't mind the rust and dirt that much. I repacked the bottom bracket (getting those cranks off sucked. Heat is my friend.) and got down to business with some more free fixed gear parts.




Now, enough of the story. I don't dig that I don't have a seat.

I despise this style seatpost, even if it had the top clamp I would replace it because the bolts stick out the sides and rip your clothes if you run a thin (in width) saddle. (not my pic)



I measured the inner diameter approximately: 24.5mm. Might be 25. Does this sound right? Can I use a 25.6mm seatpost here?

Any help would be appreciated. Ebay posts this size are ridiculously priced. I'm probably heading down a bicycle boneyard with the derailleurs off the frame to trade for a seatpost.

Last edited by stien; 06-17-10 at 12:43 PM.
stien is offline   Reply With Quote
Old 06-16-10, 10:36 AM   #2
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Bikes:
Posts: 16,839
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 141 Post(s)
You need a 25.4 mm post. Not smaller. Not larger.

Google 25.4 Laprade and you'll find cheap new ones. You can find nice vintage posts on eBay.
Grand Bois is offline   Reply With Quote
Old 06-16-10, 10:43 AM   #3
stien
neits
Thread Starter
 
stien's Avatar
 
Join Date: Apr 2010
Location: Cape Cod, MA
Bikes:
Posts: 1,664
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Exactly what I needed, thanks! I appreciate it.
stien is offline   Reply With Quote
Old 06-17-10, 11:37 AM   #4
stien
neits
Thread Starter
 
stien's Avatar
 
Join Date: Apr 2010
Location: Cape Cod, MA
Bikes:
Posts: 1,664
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bought a seatpost online yesterday, got it today in the mail on my lunch break. Gotta love that. The shop was only 100 miles away
My heart dropped when it didn't fit though. I did notice that the clamping area diameter was smaller than the rest of the seat tube however. Someone must have cranked it down on a smaller seatpost. I need to find a way to essentially pry open the opening. Any ideas?
stien is offline   Reply With Quote
Old 06-17-10, 12:27 PM   #5
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Posts: 17,316
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 141 Post(s)
You might try putting a flat-bladed screwdriver into the slot and gently prying outward.

It is really weird that an otherwise all-metric Peugeot would take a 1" diameter seat post. ...
__________________
"Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
John E is offline   Reply With Quote
Old 06-17-10, 12:30 PM   #6
cudak888 
www.theheadbadge.com
 
cudak888's Avatar
 
Join Date: Sep 2005
Location: Southern Florida
Bikes: http://www.theheadbadge.com
Posts: 22,746
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Frame is bent at the headtube.

-Kurt
__________________
cudak888 is offline   Reply With Quote
Old 06-17-10, 12:33 PM   #7
23skidoo 
Gone World Hepster
 
23skidoo's Avatar
 
Join Date: Oct 2005
Location: Lincoln, NE
Bikes:
Posts: 1,273
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hie thee forthwith to the nearest lbs and pick up a 1" Pyramid seatpost for $8.
__________________
77 Trek TX300--78 Trek TX-300--79 Trek 510--83 Trek 520--83 Nickel Plated Trek 400--86 Trek Elance 400--75 Gitane Interclub--73 Viscount 'Death Fork SS--76 Viscount Aerospace Pro--80's Diamant Verbinnen--80's Basso--90's Montagner SS--84 SR Explorer MTB
23skidoo is offline   Reply With Quote
Old 06-17-10, 12:38 PM   #8
stien
neits
Thread Starter
 
stien's Avatar
 
Join Date: Apr 2010
Location: Cape Cod, MA
Bikes:
Posts: 1,664
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by cudak888 View Post
Frame is bent at the headtube.

-Kurt
Kurt,
I did notice, but I was paid to take it! Steel won't fail catastrophically like carbon does without warning. I will see the final days a long way off, and I'm already making plans to look for another free frame.
stien is offline   Reply With Quote
Old 06-17-10, 12:45 PM   #9
stien
neits
Thread Starter
 
stien's Avatar
 
Join Date: Apr 2010
Location: Cape Cod, MA
Bikes:
Posts: 1,664
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by 23skidoo View Post
Hie thee forthwith to the nearest lbs and pick up a 1" Pyramid seatpost for $8.
Ahead of ya! Got my new 25.4 seatpost today in the mail, but it doesn't fit through the opening! Someone tightened it too much. I'm thinking I might put a flathead between the two separated parts on the back of the top of the seatpost tube.
stien is offline   Reply With Quote
Old 06-17-10, 04:15 PM   #10
Iowegian
Senior Member
 
Iowegian's Avatar
 
Join Date: Dec 2005
Location: Boulder, Colo
Bikes:
Posts: 1,862
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 29 Post(s)
You might also try putting the current seatpost in upside down and using the smaller diameter part to bend the tube back. Using a screwdriver in the slot is almost guaranteed to chip the paint but in this case I guess that's not a problem.
Iowegian is offline   Reply With Quote
Old 06-17-10, 08:13 PM   #11
stien
neits
Thread Starter
 
stien's Avatar
 
Join Date: Apr 2010
Location: Cape Cod, MA
Bikes:
Posts: 1,664
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I went to town on the seatpost opening and it would not open up enough. I ended up using the old seatpost and stealing a top clamp from another bike for the time being. I accepted defeat there. The bike is finished and I was spinning out and skidding all over the place. Good to be a kid again.

Next problem is that the non drive side crank arm is done for. Loosens up in a few miles. I might try shimming it a bit but I'd like to find a replacement.
stien is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:24 AM.