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


Go Back   > >

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-14-07, 06:49 AM   #1
mulchie
Senior Member
Thread Starter
 
mulchie's Avatar
 
Join Date: Aug 2007
Bikes:
Posts: 270
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My seat keeps slipping down!

Is there any way to fix a bike seat that keeps dropping about an inch every time I ride? This is pretty annoying and I suspect it might be what makes my knees feel a twinge, too.
I'd prefer not to buy a new post since it's an older bike and I am thinking of replacing in a year if I am still mildly biking obsessed.
?????
mulchie is offline   Reply With Quote
Old 08-14-07, 06:53 AM   #2
Siu Blue Wind
Flowers for mom
 
Siu Blue Wind's Avatar
 
Join Date: Apr 2005
Bikes:
Posts: 10,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Cut a piece of soda can as a shim.
__________________
Quote:
Originally Posted by Buddha
We are what we think. All that we are arises with our thoughts. With our thoughts, we make the world.
Quote:
Originally Posted by making View Post
Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.
Siu Blue Wind is offline   Reply With Quote
Old 08-14-07, 06:56 AM   #3
supcom
You need a new bike
 
supcom's Avatar
 
Join Date: Aug 2002
Bikes:
Posts: 5,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you have a quick release seatpost clamp, try a bolt-type. I had this problem on a hardtail and replacing the clamp did the trick.
supcom is offline   Reply With Quote
Old 08-14-07, 08:38 AM   #4
Bluechip
Senior Member
 
Bluechip's Avatar
 
Join Date: Jul 2003
Location: Cypress TX
Bikes: Salsa Fargo Ti, Cannondale CAAD9, Carbonello Fixed Gear, Specialized Epic Disc
Posts: 1,092
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I 2nd the soda can idea. It's worked for me.
Bluechip is offline   Reply With Quote
Old 08-14-07, 08:45 AM   #5
Steve Hamlin
Loco Motive Member
 
Steve Hamlin's Avatar
 
Join Date: Mar 2007
Bikes:
Posts: 165
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Mine seat keeps slipping down, too . . .

I've written it off to middle age. . . Oh, you mean your BIKE seat. . .

(The preferred aluminum can to use for a shim is a beer can; cq: "Zen and the Art of Motorcycle Maintenance.")
__________________
Roll away the dew!
Steve Hamlin is offline   Reply With Quote
Old 08-14-07, 10:25 AM   #6
bike2math
Senior Member
 
Join Date: Mar 2005
Location: Texas
Bikes:
Posts: 959
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just solved this problem on my bike. I tried all sorts of ideas, a couple of different seatpost, collar, and bolt combinations; and a couple of different beer can shims, all with the help of the wonderful guys at Bike Source in Columbus. The only thing that was working was riding my 15 mile rt commute standing up.

What finally worked was carefully cleaning all of the grease off the post and seattube with rubbing alcohol and then rubbing dirt (nice ohio clay fact) over the tube. No slip since.

The mechs at B.S. suggested that once or twice a year I free the post and move it slightly, although this was the very last thing I tried so if it does cold weld at some point I'm no worse off than I was before (and it will still stay set at the correct height). Of course YMMV
bike2math is offline   Reply With Quote
Old 08-14-07, 01:02 PM   #7
KingTermite 
On my TARDIScycle!
 
KingTermite's Avatar
 
Join Date: Jun 2005
Location: Eastside Seattlite Termite Mound
Bikes: Trek 520, Trek Navigator 300, Peugeot Versailles PE10DE
Posts: 3,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by supcom View Post
If you have a quick release seatpost clamp, try a bolt-type. I had this problem on a hardtail and replacing the clamp did the trick.
+1

I had the same problem (and solution) too.
__________________
Quote:
Originally Posted by coffeecake View Post
- it's pretty well established that Hitler was an *******.
KingTermite is offline   Reply With Quote
Old 08-14-07, 06:55 PM   #8
Garfield Cat
Senior Member
 
Garfield Cat's Avatar
 
Join Date: Oct 2004
Location: Huntington Beach, CA
Bikes: Cervelo Prodigy
Posts: 5,938
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
What if you bought a brand new Thomson Masterpiece seatpost, used it and when you get a new bike, put the Thomson on it?
Garfield Cat is offline   Reply With Quote
Old 08-14-07, 07:36 PM   #9
G-Whacker
Affable Aberrant
 
G-Whacker's Avatar
 
Join Date: Jun 2007
Location: GDTRFB
Bikes:
Posts: 209
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I like the shim idea, but the first thought I had was a pipe clamp on the post (covered in duct tape of course!)
G-Whacker is offline   Reply With Quote
Old 08-14-07, 07:55 PM   #10
qmsdc15
Banned
 
Join Date: Mar 2004
Location: Maryland
Bikes: rockhopper, delta V, cannondale H300, Marin Mill Valley
Posts: 5,155
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Garfield Cat View Post
What if you bought a brand new Thomson Masterpiece seatpost, used it and when you get a new bike, put the Thomson on it?
Because different frames require different size posts. Also the Thomson may require a shim too. Mine does.
qmsdc15 is offline   Reply With Quote
Old 08-14-07, 08:00 PM   #11
Nermal
Senior Member
 
Nermal's Avatar
 
Join Date: Jan 2006
Location: Farmington, NM
Bikes: Giant Cypress SX
Posts: 2,060
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The Thompson (elite is all I could afford) has very fine stirations around the length of the tube. That could help - I haven't mounted it yet.

I fitted my other bike with a Salsa bolt type clamp and the problem went away, and am still keeping a little grease on the seatpost.
__________________
Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.
Nermal is offline   Reply With Quote
Old 08-15-07, 02:18 AM   #12
mentat6059
I pedal what I ride
 
Join Date: Dec 2005
Bikes:
Posts: 89
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
if the shim doesn't fit then try putting loctite between the seatpost and the seattube
mentat6059 is offline   Reply With Quote
Old 08-15-07, 06:08 AM   #13
hoss10
"Big old guy"
 
Join Date: Dec 2004
Bikes: Trure North Touring, Cannondale Killer V
Posts: 240
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
First of all make sure you have the right size seatpost.
Second get a bolt on seat post collar.
Third go to a bike shop and ask for some of the grease that comes with some seatposts (I know FSA ships it) It is a gritty grease that you put on before installing the post.
If that does not work go with some sand on the grease.

I am heavy and I have had this problem before, interestlly enough the Thompson which has the lathe cuts so it should stay up was one of the worst post I had for slipping. I hope this helps.
hoss10 is offline   Reply With Quote
Old 08-15-07, 03:24 PM   #14
ChipSeal
www.chipsea.blogspot.com
 
ChipSeal's Avatar
 
Join Date: Mar 2007
Location: South of Dallas, Texas
Bikes: Giant OCR C0 road
Posts: 1,026
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A common problem with carbon frames and carbon seat posts. In that situation a dab of "technical grease" solves the problem. I truly does work as advertised.

http://www.tacx.com/producten.php?fl...enance%20Tools
ChipSeal is offline   Reply With Quote
Old 08-15-07, 03:41 PM   #15
mulchie
Senior Member
Thread Starter
 
mulchie's Avatar
 
Join Date: Aug 2007
Bikes:
Posts: 270
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've now tried alcohol, toothpaste (!) then spit and dirt. So far so good. 2.5 bumpy miles w/ no slip (sorry, but the toothpaste alone didn't work at all).
But I'm taking her in for a tune up on Sunday and I'll see if they can do the right thing w/ the mechanics grease.
all useful advice. Thanks everyone.
mulchie is offline   Reply With Quote
Old 08-15-07, 08:52 PM   #16
Nermal
Senior Member
 
Nermal's Avatar
 
Join Date: Jan 2006
Location: Farmington, NM
Bikes: Giant Cypress SX
Posts: 2,060
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by hoss10 View Post
I am heavy and I have had this problem before, interestlly enough the Thompson which has the lathe cuts so it should stay up was one of the worst post I had for slipping. I hope this helps.
Thanks. Thanks ever so much for filling me in on my new but untried thompson.
__________________
Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.
Nermal 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 07:00 AM.