Advertise on Bikeforums.net



User Tag List

Results 1 to 16 of 16
  1. #1
    Junior Member
    Join Date
    Nov 2009
    Posts
    5
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    seatCLAMP shim please...

    this is similar to that other thread with NO answer so im going to try to ask it again. im simply looking for a shim to use a 31.8mm QR seatclamp on a frame that wants a 30.0mm seatclamp. seems simple enough right? wrong. there HAS to be someone who has figured out a simple yet effective method to shore that up.... hopefully

  2. #2
    a77impala a77impala's Avatar
    Join Date
    Oct 2005
    Location
    Western South Dakota
    Posts
    1,251
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have seen posts on similar questions saying to use a strip of aluminum from a beer or pop can. .8mm is pretty small one strip may do it.
    It's worth a try. I have used shims like this to use a smaller seat post in a larger tube, worked great.
    Treks, 85-420, 87-560, 90-930,92-970, 95-930, 96-1220, LeMonds, 2000 Zurich, 05-Etape, 06-Versailles

  3. #3
    Kid A TurbineBlade's Avatar
    Join Date
    Aug 2009
    Location
    Alexandria, VA
    Posts
    1,778
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The best method is to just get the right parts.

    I've shimmed many seatposts and a set of handlebars with a soda can sliver cut with scissors. You have to play with the length of shim you need and usually "twist" the seat post with the shim to get it into the seat tube, but it works fine if you get the shim in there properly.

    That said, it is so much easier and less crappy to just get the right parts.

  4. #4
    Arsehole PlatyPius's Avatar
    Join Date
    Jul 2008
    Posts
    2,278
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Just buy the right damn part.... rigging something usually never works out well.

    http://www.wiggle.co.uk/p/cycle/7/Sa...mp/5360042535/

  5. #5
    Junior Member
    Join Date
    Nov 2009
    Posts
    5
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    thanks for the responses. and yes i know its better to use the right part, BUT... i found the most trick seatclamp, KCNC superlight, and im determined to make it work. thin aluminum is the way i've been too. i was thinking "metal tape", then i thought of an old tape measure about 1/4" wide or so and cut about a foot off and see how many wraps i need. is this failure or no?

  6. #6
    Arsehole PlatyPius's Avatar
    Join Date
    Jul 2008
    Posts
    2,278
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Congratulations on your upcoming Darwin Award....

  7. #7
    bike whisperer Kimmo's Avatar
    Join Date
    Dec 2009
    Location
    Melbourne, Oz
    My Bikes
    copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
    Posts
    6,842
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Shim it with epoxy.

    I reckon it's a pretty slack trend, away from integrated clamps... and what's with all the clamp-on FDs, for crying out loud?

  8. #8
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by mke-bruiser View Post
    thanks for the responses. and yes i know its better to use the right part, BUT... i found the most trick seatclamp, KCNC superlight, and im determined to make it work. thin aluminum is the way i've been too. i was thinking "metal tape", then i thought of an old tape measure about 1/4" wide or so and cut about a foot off and see how many wraps i need. is this failure or no?
    A pop can/beer can will work and i'll add to the buy the right clamp. It's going to nullify however cool that clamp is going to look with metal shims anyways
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  9. #9
    Senior Member bigvegan's Avatar
    Join Date
    Feb 2009
    Posts
    659
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by mke-bruiser View Post
    thanks for the responses. and yes i know its better to use the right part, BUT... i found the most trick seatclamp, KCNC superlight, and im determined to make it work. thin aluminum is the way i've been too. i was thinking "metal tape", then i thought of an old tape measure about 1/4" wide or so and cut about a foot off and see how many wraps i need. is this failure or no?
    A "most trick" seatclamp with a jury-rigged shim ceases to be trick.

    Just buy the right part, they're not expensive.

  10. #10
    Senior Member BCRider's Avatar
    Join Date
    Mar 2008
    Location
    The 'Wack, BC, Canada
    My Bikes
    Norco (2), Miyata, Canondale, Soma, Redline
    Posts
    5,435
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You've got it all wrong. Instead of shimming the clamp you need to dump your frame and buy one to fit that super trick seatpost clamp....

    I have to go with the others that say a shimmed trick clamp ain't so trick when the shims are there. Stick your trick clamp into the parts box for some future project bike and get the correct size. Besides, unless you're very lucky and one or two layers is just the right amount the clamp won't hold with a full and even 360 grip. And when that doesn't happen you'll find that your post wiggles around and sinks down the tube requiring you to stop and lift it up into place frequently.
    Model airplanes are cool too!.....

  11. #11
    nice idea, poor execution
    Join Date
    Oct 2009
    Location
    West Newton, MA
    Posts
    397
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yo but the clamp is purple it totally rules.
    Kevin Duffy, Harris Cyclery, West Newton, MA.
    blog.harriscyclery.com

  12. #12
    Banned
    Join Date
    Jul 2011
    Posts
    1
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Plumber Screw Clamps

    Something that worked for me is those plumber screw clamps. They come in different thicknesses, are already circular, and have a course surface. I used a dremmel to cut the excess, inserted the piece to the inside of the clamp, and then I clamped on a spare post to get the shim to mold to the inside of the clamp. This makes it easier to slide on the real post without scratching it. The aluminum can idea is fail since I found there is play from side to side. This is probably due to it being very smooth and the surfaces slipping past one another.

    I definitely agree with the other posters that you should get the right clamp for the right post, but in my case .....the seat clamp had a forged cable stop for cantis. Finding the right size clamp with a forged stop is very rare and although there are other options, it was the cleanest option for someone looking to run cantis on a frame that doesn't have stops.


  13. #13
    Senior Member
    Join Date
    Jun 2007
    Posts
    1,525
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I expect he found a solution about a year and a half back.....

  14. #14
    Kid A TurbineBlade's Avatar
    Join Date
    Aug 2009
    Location
    Alexandria, VA
    Posts
    1,778
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Epic thread revival sleus -- the OP is probably a senator by now.
    Cyclist, angler and aquarist

  15. #15
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    3,164
    Mentioned
    46 Post(s)
    Tagged
    0 Thread(s)
    easy.. just need a lathe to turn down tubing to spec.

  16. #16
    Administrator CbadRider's Avatar
    Join Date
    Sep 2008
    Location
    On the bridge with Picard
    My Bikes
    Specialized Allez, Specialized Sirrus
    Posts
    5,840
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by shelbyfv View Post
    I expect he found a solution about a year and a half back.....
    You're probably right.

    Thread closed.
    Quote Originally Posted by toddles View Post
    So Tom only hires people that are nutty? Is part of the requirement to be a moderator on this site is that you have to be nuts??
    Forum Guidelines *click here*

Posting Permissions

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