Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    PDR
    PDR is offline
    Senior Member
    Join Date
    Jan 2008
    Location
    Cheshire, North West England, UK
    My Bikes
    Brompton S2L-X, Bridgestone Moulton, 1963 & 1966 Moultons, Scott Mountain bike
    Posts
    555
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    My method for setting seat hight on a Brompton

    I thought that I would share a method I have been using for the last 22 months to set the hight of a Brompton seat.

    What you need is a sheet of plastic motorcycle tank protection film.
    I bought mine from Hein Gericke but I’m sure that there are other sources of this self adhesive plastic film. It is about 1mm thick and quite hard wearing (I have only needed to change this film once)

    http://www.hein-gericke.co.uk/shop/p...oducts_id/7274

    What you need to do is ride around for a while until you have determined the best seat hight for you. Then take a marker pen and mark where the seat post enters the frame.
    Now pull the seat post fully up and measure the distance between the pen mark and the frame (in my case it was a little over 1”). Now with the bike still in the ready to ride sate (e.g. the rear wheel NOT folded under in the “park” position), drop the seat post down to the floor to expose the bottom of the seat post. Next cut a strip of plastic that corresponds to the measurement you took between the pen mark with the seat at your comfortable riding height and the fully extended height. Wrap the strip around the bottom of the post, mark where it overlaps and trim it to length so that it forms a collar. Remove the backing paper and wrap the protection film around the bottom of the post just above the flared section.

    Now each time you use the bike you can just pull the seat up as far as it will go and it will stop at your perfect height. I have been using this now for nearly 2 years and it works great and as I say, I have only had to replace the film once. It is also a simple task to remove the film if required.

    Here is a photo of my Brompton with the film fitted.

    takes longer to explain the method than to actually cut and fit the film.

    I hope this is of use to other Brompton owners.

  2. #2
    Part-time epistemologist invisiblehand's Avatar
    Join Date
    Jun 2005
    Location
    Washington, DC
    My Bikes
    Jamis Nova, Bike Friday NWT, STRIDA, Austro Daimler Vent Noir, Haluzak Horizon, Salsa La Raza, Hollands Tourer, Bike Friday tikit
    Posts
    5,181
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Nice idea.

    How come you didn't just mark the tube from the underside?

  3. #3
    PDR
    PDR is offline
    Senior Member
    Join Date
    Jan 2008
    Location
    Cheshire, North West England, UK
    My Bikes
    Brompton S2L-X, Bridgestone Moulton, 1963 & 1966 Moultons, Scott Mountain bike
    Posts
    555
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Because you can't see the end of the seat post with the seat up in the ready to ride position.

  4. #4
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    571
    Mentioned
    31 Post(s)
    Tagged
    0 Thread(s)
    So , supposing .. this is Mark minus width of the frame bushing?
    since tape wont slide past the plastic bushing..

  5. #5
    PDR
    PDR is offline
    Senior Member
    Join Date
    Jan 2008
    Location
    Cheshire, North West England, UK
    My Bikes
    Brompton S2L-X, Bridgestone Moulton, 1963 & 1966 Moultons, Scott Mountain bike
    Posts
    555
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fietsbob View Post
    So , supposing .. this is Mark minus width of the frame bushing?
    since tape wont slide past the plastic bushing..
    Yes, that is the idea... the plastic is thick / strong enough to stop up inside the frame at the frame bushing (rather than the very end, flared end of the seat post tube).

  6. #6
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    571
    Mentioned
    31 Post(s)
    Tagged
    0 Thread(s)
    wonder what the US equivalent source may be for something similar ?,
    Generic, that a Polycarbonate film with the sticky stuff ?

    only a Marine supply shop here to keep the commercial fishers going out.
    or the auto parts shop..

  7. #7
    747 Freight Pilot bicycleflyer's Avatar
    Join Date
    Aug 2008
    Location
    Ohio, USA
    My Bikes
    Rivendell, Bike-Friday Pocket-Rocket and one home made fixed gear
    Posts
    458
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I did something similar with my Bike-Friday. I just used a hose clamp secured to the seat post. I slide it down till the clamp rests on the tube and then secure it.
    Flying an airplane is really very simple...Push the stick forward, the house gets big. Pull the stick back, the house gets small. Keep holding the stick back, the house gets big again.

Posting Permissions

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