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 12-07-13, 10:29 PM   #1
tomn
www.Click-Stand.com
Thread Starter
 
tomn's Avatar
 
Join Date: Jan 2006
Location: Aberdeen, WA
Bikes: Owner built touring & tandem
Posts: 374
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Brompton Top Tube Diameter?

Hi All,

I'm looking for a little help. Would someone with a Brompton accurately measure the diameter of the top tube for me?

Many thanks in advance,
Tom
tomn is offline   Reply With Quote
Old 12-08-13, 08:49 AM   #2
rhenning
Senior Member
 
Join Date: Apr 2006
Bikes:
Posts: 2,458
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
The diameter might change from model to model and year to year so the specific model/year might help. Roger
rhenning is offline   Reply With Quote
Old 12-08-13, 09:31 AM   #3
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)
45mm for a 2013 model.
BassNotBass is offline   Reply With Quote
Old 12-08-13, 12:51 PM   #4
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,795
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 216 Post(s)
Aka 1.75" OD..
fietsbob is online now   Reply With Quote
Old 12-08-13, 01:12 PM   #5
smallwheeler
Senior Member
 
smallwheeler's Avatar
 
Join Date: Aug 2012
Location: NYC
Bikes:
Posts: 2,175
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Quote:
Originally Posted by fietsbob View Post
Aka 1.75" OD..
i think you mean 1.771"
smallwheeler is offline   Reply With Quote
Old 12-08-13, 01:20 PM   #6
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,795
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 216 Post(s)
Bike frames tubes other than a French Cul de Sac, since abandoned,
tend to be fractional , so have to be stated as a decimal mm, ala 28.6mm

so .. 1.75" x 25.4=44.45mm


Add: then theres the thickness of the powder coat finish..

Last edited by fietsbob; 12-16-13 at 02:04 PM.
fietsbob is online now   Reply With Quote
Old 12-08-13, 02:53 PM   #7
smallwheeler
Senior Member
 
smallwheeler's Avatar
 
Join Date: Aug 2012
Location: NYC
Bikes:
Posts: 2,175
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Quote:
Originally Posted by fietsbob View Post
Bike frames tubes other than a French Cul de Sac, since abandoned,
tend to be fractional , so have to be stated as a decimal mm, ala 28.6mm

so .. 1.75" x 25.4=44.45mm
the point was to highlight the convoluted absurdity of continually having to convert, reconcile, or otherwise resolve english standard factional, decimal, and metric systems. your last statement here adds the next layer of goofiness: the measurements are in fact nominal relative to "industry standards" and the original system of measure used. ugh...
smallwheeler is offline   Reply With Quote
Old 12-08-13, 03:19 PM   #8
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,795
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 216 Post(s)
Napoleon Bonapart French Revolution EtAl, wanted the Measurement system not based on the size of the King's Feet.

England still likes Royalty. (gives the paparazzi something to do)

The meter was originally defined to be one ten millionth of the distance between the
North Pole and Equator, on a longitude through Paris.

even that proved to be Off, when a standard piece was Made to be the reference to calibrate all others.

And the Prime meridian of Longitude is on the Greenwich Observatory in England ,
Not through Paris..

Last edited by fietsbob; 12-08-13 at 03:23 PM.
fietsbob is online now   Reply With Quote
Old 12-08-13, 04:01 PM   #9
Ozonation
Senior Member
 
Ozonation's Avatar
 
Join Date: Apr 2012
Location: Ontario, Canada
Bikes: Rivendell Sam Hillborne DTT in Awesome Green; Brompton M6R (reduced gearing) in Sage Green; GT Timberline Hybrid (10 years old!)
Posts: 1,014
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Uhh... what road did this thread suddenly head down?
Ozonation is offline   Reply With Quote
Old 12-08-13, 04:06 PM   #10
smallwheeler
Senior Member
 
smallwheeler's Avatar
 
Join Date: Aug 2012
Location: NYC
Bikes:
Posts: 2,175
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Quote:
Originally Posted by fietsbob View Post
Napoleon Bonapart French Revolution EtAl, wanted the Measurement system not based on the size of the King's Feet.

England still likes Royalty. (gives the paparazzi something to do)

The meter was originally defined to be one ten millionth of the distance between the
North Pole and Equator, on a longitude through Paris.

even that proved to be Off, when a standard piece was Made to be the reference to calibrate all others.

And the Prime meridian of Longitude is on the Greenwich Observatory in England ,
Not through Paris..
you forgot to mention the fact that the metric system is 10 based, which is the salient point.

smallwheeler is offline   Reply With Quote
Old 12-08-13, 10:29 PM   #11
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,795
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 216 Post(s)
Graphics with colors FTW.
fietsbob is online now   Reply With Quote
Old 12-15-13, 11:55 PM   #12
darukhan
Senior Member
 
darukhan's Avatar
 
Join Date: Nov 2011
Location: Chicago-land
Bikes:
Posts: 266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)


darukhan is offline   Reply With Quote
Old 12-16-13, 10:25 AM   #13
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,795
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 216 Post(s)
.. Depends on what the definition of Is, is, said the Sax playing Lawyer from Arkansas.

Last edited by fietsbob; 12-16-13 at 11:04 AM.
fietsbob is online now   Reply With Quote
Old 12-16-13, 10:53 AM   #14
darukhan
Senior Member
 
darukhan's Avatar
 
Join Date: Nov 2011
Location: Chicago-land
Bikes:
Posts: 266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)





...and to keep this on topic (a the utmost minimum) ....I suppose the measurement of the top bar could be inconsistent if you measure at the bends in the tube?
darukhan is offline   Reply With Quote
Old 12-17-13, 02:50 PM   #15
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,795
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 216 Post(s)
So Tom, is there a Klickstand model in the works, ?

... for those who tour with a load on top of their Brompton Rear Rack ,

so as to not be able to use the built in stand , the rear wheel fold-under..
fietsbob is online now   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 11:11 AM.