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


Go Back   > >

Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-09-12, 07:53 AM   #1
invisiblehand
Part-time epistemologist
Thread Starter
 
invisiblehand's Avatar
 
Join Date: Jun 2005
Location: Washington, DC
Bikes: Jamis Nova, Bike Friday NWT, STRIDA, Austro Daimler Vent Noir, Haluzak Horizon, Salsa La Raza, Hollands Tourer, Bike Friday tikit
Posts: 5,545
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
An ancient Brompton

From Tim at Bikes@Vienna ... a local Brompton dealer.

http://lovelybike.blogspot.com/2012/...-brompton.html

--Intro from the article--

Brompton folding bikes have remained virtually unchanged since they entered into production in the late 1980s. But before that happened, there was a small pilot run and the machines from this early batch were just a tad different. Only several hundred of these were made. Two of those recently ended up passing through Harris Cyclery on their way to the Brompton museum. And one of those I had the opportunity to photograph and ride. Pictured here is the 358th Brompton ever produced. Red and black 3-speed with upright handlebars, dynamo lighting, rear rack and fenders.*
__________________
A narrative on bicycle driving.
invisiblehand is offline   Reply With Quote
Old 08-09-12, 09:41 AM   #2
2_i 
Senior Member
 
Join Date: Sep 2005
Location: Michigan
Bikes: Trek 730, Bike Friday NWT, Brompton M6R*2, Trek 830, Trek 720, Dahon HAT060, Dahon HT060,...
Posts: 1,543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
I thought that the current Brompton bikes were an outcome of incremental improvements over many years. Learning that so much was already accomplished in the first design step makes me even more impressed.
2_i is offline   Reply With Quote
Old 08-09-12, 09:44 AM   #3
Dynocoaster
Senior Member
 
Join Date: May 2004
Location: Pacific Northwest
Bikes: Too many....................
Posts: 3,075
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thank you for that report. I would like to see a limited run of that frame,I think it is cool.
Dynocoaster is offline   Reply With Quote
Old 08-09-12, 10:01 AM   #4
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,737
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 203 Post(s)
their Mk2 bike followed that .. they used a different bender, so as to smooth out the curve.

Cast hinge pieces came recently.. production volume need
exceeded the number of skilled fillet brazers to join forged hinge plates and tubes..

so the joint was redesigned and the production job de-skilled ..

Last edited by fietsbob; 08-09-12 at 10:07 AM.
fietsbob is offline   Reply With Quote
Old 08-09-12, 10:23 AM   #5
BassNotBass
lowlife bottom feeder
 
BassNotBass's Avatar
 
Join Date: Apr 2008
Location: Lou-evil, Canned-Yucky USA
Bikes:
Posts: 1,993
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by fietsbob View Post
...Cast hinge pieces came recently...
Cast? Hmm, I wonder what the difference in strength is now.


Quote:
Originally Posted by fietsbob View Post
... production volume need
exceeded the number of skilled fillet brazers to join forged hinge plates and tubes...
Were the fillet brazed joints also dressed/cleaned-up? That's time consuming work.
BassNotBass is offline   Reply With Quote
Old 08-09-12, 10:54 AM   #6
mulleady
The Metropolis, UK
 
Join Date: Aug 2007
Bikes:
Posts: 2,353
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for sharing. It is a bit like the original Thinkpad keyboard. You don't try to fix something that works so well. Apart from eliminating the humpback and machining a curved frame the fold concept has stood the test of time.
mulleady is offline   Reply With Quote
Old 08-09-12, 11:54 AM   #7
bhkyte
Senior Member
 
bhkyte's Avatar
 
Join Date: Sep 2008
Location: York UK
Bikes: 2X dualdrive Mezzo folder,plus others
Posts: 2,791
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Quote:
Originally Posted by invisiblehand View Post
Brompton folding bikes have remained virtually unchanged since they entered into production in the late 1980s.
Unfortunately !
bhkyte is offline   Reply With Quote
Old 08-09-12, 05:23 PM   #8
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,737
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 203 Post(s)
Quote:
Cast? Hmm, I wonder what the difference in strength is now.
dont think the strength went down , there was some fatigue
on the brazed joint over time, Im told, so may be an improvement.

had a Mk2 which I have since resold. when I got a Mk4.

Quote:
Were the fillet brazed joints also dressed/cleaned-up?
No, fillet build up is pretty smooth..
... they did the same thing all week long..

what the cast hinge assembly allows is a torch array jig, a production tool,
where the parts are heated in all directions, in alignment, to the brass melt point .
Lugged frames are similar in that regard. .. capillary penetration.

Last edited by fietsbob; 08-10-12 at 09:36 AM.
fietsbob is offline   Reply With Quote
Old 08-10-12, 07:42 AM   #9
BassNotBass
lowlife bottom feeder
 
BassNotBass's Avatar
 
Join Date: Apr 2008
Location: Lou-evil, Canned-Yucky USA
Bikes:
Posts: 1,993
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the explanation, fietsbob. Good info.
BassNotBass 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 08:51 PM.