Advertise on Bikeforums.net



User Tag List

Results 1 to 15 of 15
  1. #1
    www.Click-Stand.com tomn's Avatar
    Join Date
    Jan 2006
    Location
    Aberdeen, WA
    My Bikes
    Owner built touring & tandem
    Posts
    370
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(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
    [SIGPIC][/SIGPIC] www.Click-Stand.com

  2. #2
    Senior Member
    Join Date
    Apr 2006
    Posts
    2,195
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    The diameter might change from model to model and year to year so the specific model/year might help. Roger

  3. #3
    lowlife bottom feeder BassNotBass's Avatar
    Join Date
    Apr 2008
    Location
    Lou-evil, Canned-Turkey USA
    Posts
    1,855
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    45mm for a 2013 model.
    I plan on living forever... so far so good.

  4. #4
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    1,530
    Mentioned
    33 Post(s)
    Tagged
    0 Thread(s)
    Aka 1.75" OD..

  5. #5
    Senior Member smallwheeler's Avatar
    Join Date
    Aug 2012
    Location
    NYC
    Posts
    1,733
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fietsbob View Post
    Aka 1.75" OD..
    i think you mean 1.771"

  6. #6
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    1,530
    Mentioned
    33 Post(s)
    Tagged
    0 Thread(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 01:04 PM.

  7. #7
    Senior Member smallwheeler's Avatar
    Join Date
    Aug 2012
    Location
    NYC
    Posts
    1,733
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(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...

  8. #8
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    1,530
    Mentioned
    33 Post(s)
    Tagged
    0 Thread(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 02:23 PM.

  9. #9
    Senior Member Ozonation's Avatar
    Join Date
    Apr 2012
    Location
    Ontario, Canada
    My Bikes
    Rivendell Sam Hillborne DTT in Awesome Green; Brompton M6R (reduced gearing) in Sage Green; GT Timberline Hybrid (10 years old!)
    Posts
    959
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Uhh... what road did this thread suddenly head down?
    Rivendell Sam Hillborne and Hunqapillar; Brompton M6R Sage Green; Salsa Mukluk 3 FAT Bike; Nerdy Academic; Nikonian; Wing Chun; and a Patridge in a Pear Tree.

  10. #10
    Senior Member smallwheeler's Avatar
    Join Date
    Aug 2012
    Location
    NYC
    Posts
    1,733
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(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.


  11. #11
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    1,530
    Mentioned
    33 Post(s)
    Tagged
    0 Thread(s)
    Graphics with colors FTW.

  12. #12
    Senior Member darukhan's Avatar
    Join Date
    Nov 2011
    Location
    Chicago-land
    Posts
    261
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)



  13. #13
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    1,530
    Mentioned
    33 Post(s)
    Tagged
    0 Thread(s)
    .. Depends on what the definition of Is, is, said the Sax playing Lawyer from Arkansas.
    Last edited by fietsbob; 12-16-13 at 10:04 AM.

  14. #14
    Senior Member darukhan's Avatar
    Join Date
    Nov 2011
    Location
    Chicago-land
    Posts
    261
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(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?

  15. #15
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    1,530
    Mentioned
    33 Post(s)
    Tagged
    0 Thread(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..

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •