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 10-06-08, 08:33 PM   #1
cyclotoine
Senior Member
Thread Starter
 
cyclotoine's Avatar
 
Join Date: Jul 2004
Location: Yukon, Canada
Bikes:
Posts: 8,611
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 49 Post(s)
1960s/early 1970s reynold 531 question

I have a bike from the very early 1970s (presumed built in about 71/72) made of reynold 531 butted tubes frame, fork and stays. The bike is a 62cm and it appears that a 27.0mm seatpost is the right size. I thought all butted 531 tubesets would be 27.2mm, but it appears I am wrong. I guess reynolds came with different butting configurations for different applications? Sorta like columbus SP vs. SL...

Any thoughts? I'm pretty damn sure on this as a 27.0 post slides in nicely but is snug with no rocking or play even with the binder undone, a 27.2 will not go in under any circumstance.
__________________
1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear

Last edited by cyclotoine; 10-06-08 at 09:59 PM.
cyclotoine is offline   Reply With Quote
Old 10-06-08, 08:47 PM   #2
retyred
Senior Member
 
Join Date: May 2007
Bikes:
Posts: 1,248
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Name of bicycle is........?
retyred is offline   Reply With Quote
Old 10-06-08, 08:59 PM   #3
Charles Wahl
Disraeli Gears
 
Charles Wahl's Avatar
 
Join Date: Jul 2007
Location: NYC
Bikes:
Posts: 3,131
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Is your frame custom-made? A builder might have chosen a straight-gauge tube for the seatpost on a largish frame (particularly if rider was heavy or roads rough, and Reynolds supplied those in several gauges. A butted 531 seat tube typically was 21/24 SWG for butt/upper, which is about .81/.55 mm; however straight-gauge was available in just about any gauge.
Charles Wahl is offline   Reply With Quote
Old 10-06-08, 09:33 PM   #4
Antipodes
Who cares, just ride it!
 
Join Date: Jun 2006
Location: Melbourne
Bikes: 1992ish Davidson Impulse, 1981 Apollo Gran Sport SS, 2006 Salsa Las Cruces, 2010 Soma Double Cross
Posts: 989
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by retyred View Post
Name of bicycle is........?
Corky.
Antipodes is offline   Reply With Quote
Old 10-06-08, 09:47 PM   #5
Dr.Deltron
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
Quote:
Originally Posted by Antipodes View Post
Corky.
  Reply With Quote
Old 10-06-08, 09:52 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)
My '61 Paramount runs a 27.0 post. 531, as usual.

-Kurt
__________________
cudak888 is offline   Reply With Quote
Old 10-06-08, 09:56 PM   #7
cyclotoine
Senior Member
Thread Starter
 
cyclotoine's Avatar
 
Join Date: Jul 2004
Location: Yukon, Canada
Bikes:
Posts: 8,611
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 49 Post(s)
Quote:
Originally Posted by cudak888 View Post
My '61 Paramount runs a 27.0 post. 531, as usual.

-Kurt
Did the seatpost you are using come from Little Darwin? I.e. corky? That would confirm it is indeed the size I need, just trying to be 100 percent sure.... I'm way to anal as usual.

worst case scenario is I use the 27.0 from my Marinoni Pista and put the horendous zeus post in the Marinoni till I can find a suitable replacement. Ebay is dry ATM.
__________________
1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear
cyclotoine is offline   Reply With Quote
Old 10-06-08, 10:07 PM   #8
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)
Quote:
Originally Posted by cyclotoine View Post
Did the seatpost you are using come from Little Darwin? I.e. corky? That would confirm it is indeed the size I need, just trying to be 100 percent sure.... I'm way to anal as usual.

worst case scenario is I use the 27.0 from my Marinoni Pista and put the horendous zeus post in the Marinoni till I can find a suitable replacement. Ebay is dry ATM.
As a matter of fact, its a good thing you mentioned Corky. The post on my '61 Paramount is from Lotek (or was it Luker?), but the post on my Trek 610 is from Corky.

Surprise, it's a 27.2.

-Kurt
__________________
cudak888 is offline   Reply With Quote
Old 10-06-08, 11:25 PM   #9
cyclezen
OM boy
 
cyclezen's Avatar
 
Join Date: Jul 2005
Location: Goleta CA
Bikes: a bunch
Posts: 3,122
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 44 Post(s)
Quote:
Originally Posted by cyclotoine View Post
I have a bike from the very early 1970s (presumed built in about 71/72) made of reynold 531 butted tubes frame, fork and stays. The bike is a 62cm and it appears that a 27.0mm seatpost is the right size. I thought all butted 531 tubesets would be 27.2mm, but it appears I am wrong. I guess reynolds came with different butting configurations for different applications? Sorta like columbus SP vs. SL...

Any thoughts? I'm pretty damn sure on this as a 27.0 post slides in nicely but is snug with no rocking or play even with the binder undone, a 27.2 will not go in under any circumstance.
Reynolds 531 butted could have been found in a number of seattube IDs. from 27.2 down to 26.4 and prolly even smaller. I remember my 71 PX10 was 26.4 and my Limongi (76) was Reynolds Superlight 531DB and also is 26.4. 26.8 is very common.
And 27.0 was as common as 27.2 (maybe more...) for Reynolds built in the 70s and even early 80's.

I'm sure there's a source for listing some of the common bikes and seattube sizes...

use what fits best
cyclezen is offline   Reply With Quote
Old 10-06-08, 11:40 PM   #10
cyclotoine
Senior Member
Thread Starter
 
cyclotoine's Avatar
 
Join Date: Jul 2004
Location: Yukon, Canada
Bikes:
Posts: 8,611
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 49 Post(s)
Quote:
Originally Posted by cudak888 View Post
As a matter of fact, its a good thing you mentioned Corky. The post on my '61 Paramount is from Lotek (or was it Luker?), but the post on my Trek 610 is from Corky.

Surprise, it's a 27.2.

-Kurt
Thanks, kurt. I was wondering how I could have screwed this up. I was sure I had the right seatpost size and was a little confused. To be honest I don't know why I was so sure but I can only assume I had confirmed what the seatpost size was sometime in the past. I'll have to hone out the seat tube a little, maybe it's a bit of build-up of primer and such though it looked pretty clean.
__________________
1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear
cyclotoine is offline   Reply With Quote
Old 10-07-08, 06:09 PM   #11
CharlesC
Old biker
 
Join Date: Jun 2006
Location: Radium Springs, NM
Bikes: Custom Cammack touring road and 1987 Fisher Hoo Koo E Koo
Posts: 252
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
When I made frames I would substitute a down tube for the lighter seat tube for frames I made for real heavy riders. Required a smaller diameter seat post.
CharlesC is offline   Reply With Quote
Old 10-07-08, 06:31 PM   #12
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)
Quote:
Originally Posted by cyclotoine View Post
Thanks, kurt. I was wondering how I could have screwed this up. I was sure I had the right seatpost size and was a little confused. To be honest I don't know why I was so sure but I can only assume I had confirmed what the seatpost size was sometime in the past. I'll have to hone out the seat tube a little, maybe it's a bit of build-up of primer and such though it looked pretty clean.
Have the local shop run the hone through it, and it should be fine. Might have needed it all along.

Quote:
Originally Posted by CharlesC View Post
When I made frames I would substitute a down tube for the lighter seat tube for frames I made for real heavy riders. Required a smaller diameter seat post.
Curious, what would you have spec'ed for someone 235lbs riding a 59cm frame? Thicker gauge, I'd assume? My '61 Paramount, as I mentioned before, has a slightly thicker seat tube, and I dare say it is one of the reasons I am rather partial to it (not to mention the stiff English-type fork bend).

-Kurt
__________________
cudak888 is offline   Reply With Quote
Old 10-07-08, 06:33 PM   #13
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Bikes:
Posts: 16,836
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 139 Post(s)
Quote:
Originally Posted by cyclezen View Post
Reynolds 531 butted could have been found in a number of seattube IDs. from 27.2 down to 26.4 and prolly even smaller. I remember my 71 PX10 was 26.4 and my Limongi (76) was Reynolds Superlight 531DB and also is 26.4. 26.8 is very common.
And 27.0 was as common as 27.2 (maybe more...) for Reynolds built in the 70s and even early 80's.

I'm sure there's a source for listing some of the common bikes and seattube sizes...

use what fits best
Your PX10 had a smaller ID seat tube only because it had a smaller OD. Peugeot and other French builders used metric sized tubesets.

Sheldon's seatpost size database:
http://sheldonbrown.com/seatpost-sizes.html

I was surprised to find that the seatpost for my '74 Raleigh Competition is a 27.0 until I looked at the above reference and found that it's straight guage.

Last edited by Grand Bois; 10-07-08 at 06:37 PM.
Grand Bois 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 11:46 PM.