Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Handlebars keep slipping!

Notices
Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Handlebars keep slipping!

Old 06-19-13, 12:15 AM
  #1  
cptsilver
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SoCal
Posts: 147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Handlebars keep slipping!

I can't get the stem to clamp tight enough on the bars. They ar both the right size, and I've tightened the bolt as much as I can. As soon as I put some weight on the hoods, the bars would start to turn downwards. I'm new to vintage parts, is this a common problem? Are there tricks to get the bars clamped properly? Thanks.
cptsilver is offline  
Old 06-19-13, 01:57 AM
  #2  
Zinger
Trek 500 Kid
 
Zinger's Avatar
 
Join Date: Feb 2013
Location: Spokane WA
Posts: 2,564

Bikes: '83 Trek 970 road --- '86 Trek 500 road

Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 2568 Post(s)
Liked 174 Times in 139 Posts
You could shim it with a very thin gauge strip of metal. Like shim material.
Zinger is offline  
Old 06-19-13, 03:19 AM
  #3  
photogravity
Hopelessly addicted...
 
photogravity's Avatar
 
Join Date: Aug 2009
Location: Central Maryland
Posts: 5,007

Bikes: 1949 Hercules Kestrel, 1950 Norman Rapide, 1970 Schwinn Collegiate, 1972 Peugeot UE-8, 1976 Raleigh Sports, 1977 Raleigh Sports, 1977 Jack Taylor Tandem, 1984 Davidson Tandem, 2010 Bilenky "BQ" 650B Constructeur Tandem, 2011 Linus Mixte

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Handlebars keep slipping!

beer can or soda can shim.
photogravity is offline  
Old 06-19-13, 05:32 AM
  #4  
randyjawa 
Senior Member
 
randyjawa's Avatar
 
Join Date: Apr 2007
Location: Thunder Bay, Ontario, Canada - burrrrr!
Posts: 10,920

Bikes: 1958 Rabeneick 120D, 1968 Legnano Gran Premio, 196? Torpado Professional, 2000 Marinoni Piuma

Mentioned: 187 Post(s)
Tagged: 0 Thread(s)
Quoted: 1131 Post(s)
Likes: 0
Liked 968 Times in 587 Posts
Once tightened, look at the gap on the clamping section of the stem. Is the gap closed up and/or touching at any point? If so, the fit is incorrect and, yes, a shim will probably work just fine. Or...

It is possible that the bolt is improper and not threading all the way into its fit. If so, get a proper bolt.

You might also want to share some pictures with us. It might help.
__________________
"98% of the bikes I buy are projects".
randyjawa is offline  
Old 06-19-13, 06:09 AM
  #5  
Phil_gretz
Journeyman Bike Commuter
 
Phil_gretz's Avatar
 
Join Date: Aug 2009
Location: Alexandria, VA
Posts: 6,803

Bikes: '79 Peugeot PXN10LE, '88 Fuji Saratoga, '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '16 Motobecane Gran Premio Elite, '18 Velobuild VB-R-022, '21 Tsunami SNM-100

Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 1360 Post(s)
Liked 1,302 Times in 700 Posts
Is it a quill stem? The clamp diameter will be marked on the quill beneath the minimum insertion point. Clamp diameter 26.0mm? Measure the clamp area on the handlebar with a good set of digital calipers. Clamp area = 25.4mm?

Shim.
Phil_gretz is online now  
Old 06-19-13, 06:49 AM
  #6  
norskagent
car dodger
 
norskagent's Avatar
 
Join Date: Aug 2005
Location: garner/raleigh nc
Posts: 3,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Likes: 0
Liked 64 Times in 36 Posts
Or get the right sized bar, or stem.
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
norskagent is offline  
Old 06-19-13, 07:28 AM
  #7  
southpawboston
Senior Member
 
southpawboston's Avatar
 
Join Date: Aug 2008
Location: Somerville, MA and Catskill Mtns
Posts: 4,147
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 75 Post(s)
Liked 153 Times in 71 Posts
Originally Posted by photogravity View Post
beer can or soda can shim.
Or get a piece of brass sheet stock for $2.50 from an art supply shop and cut out a shim. Adds some bling at the same time:



southpawboston is offline  
Old 06-19-13, 07:29 AM
  #8  
southpawboston
Senior Member
 
southpawboston's Avatar
 
Join Date: Aug 2008
Location: Somerville, MA and Catskill Mtns
Posts: 4,147
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 75 Post(s)
Liked 153 Times in 71 Posts
Originally Posted by photogravity View Post
beer can or soda can shim.
Or get a piece of brass sheet stock for $2.50 from an art supply shop and cut out a shim. Adds some bling at the same time. This shim is 0.5mm thick and allowed me to use a handlebar with 25.4mm clamp area with a Cinelli stem with 26.4mm clamp:



southpawboston is offline  
Old 06-19-13, 07:42 AM
  #9  
Scooper
Decrepit Member
 
Scooper's Avatar
 
Join Date: Aug 2005
Location: Santa Rosa, California
Posts: 10,489

Bikes: Waterford 953 RS-22, several Paramounts

Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 625 Post(s)
Liked 45 Times in 38 Posts
Originally Posted by Phil_gretz View Post
Is it a quill stem? The clamp diameter will be marked on the quill beneath the minimum insertion point. Clamp diameter 26.0mm? Measure the clamp area on the handlebar with a good set of digital calipers. Clamp area = 25.4mm?

Shim.
This.

A 25.4mm diameter handlebar clamp area in a 26.0mm or 26.4mm will exhibit the symptom you describe.
__________________
- Stan

my bikes

Science doesn't care what you believe.
Scooper is offline  
Old 06-19-13, 08:18 AM
  #10  
puckett129
Senior Member
 
puckett129's Avatar
 
Join Date: Sep 2010
Location: Albany, NY
Posts: 441

Bikes: 80's Treks, cargo bike, Lugged LeMond, Eddy Merckx 7-11, Ciocc resto-mod, All City MM disc, and some more

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I had the same issue on a recent build. A soda can shim worked perfectly, although a little dangerous with the razor sharp edges. The stem is a little short anyway so I'm going to a threadless adapter/threadless stem setup... chrome of course.

That brass sheet above looks great on the polished chrome!
puckett129 is offline  
Old 06-19-13, 10:58 AM
  #11  
cptsilver
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SoCal
Posts: 147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
That brass insert looks great. Here are some photos, there's no size indication on the stem. Bars and stem both came with a bike I picked up, I believe they're original parts. Here are some pictures. I moved the stem over to show the center clamping area on the bars.
Attached Images
File Type: jpg
photo 1.jpg (100.3 KB, 100 views)
File Type: jpg
photo 2.jpg (91.1 KB, 104 views)
File Type: jpg
photo 3.jpg (88.2 KB, 103 views)
cptsilver is offline  
Old 06-19-13, 11:05 AM
  #12  
ColonelJLloyd 
Senior Member
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Posts: 8,382
Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 110 Post(s)
Liked 6 Times in 5 Posts
That's strange because the stem and bar were designed for one another. You might very carefully use a file to the inside of the stem or the bar clamp area to give the stem more to "bite" into. I would definitely try a carbon/aluminum paste too.

I assume not, but are you certain the handlebar sleeve itself is not slipping?
__________________
Bikes on Flickr
I prefer email to private messages. You can contact me at justinhughes@me.com
ColonelJLloyd is offline  
Old 06-19-13, 11:14 AM
  #13  
cptsilver
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SoCal
Posts: 147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by ColonelJLloyd View Post
That's strange because the stem and bar were designed for one another. You might very carefully use a file to the inside of the stem or the bar clamp area to give the stem more to "bite" into. I would definitely try a carbon/aluminum paste too.

I assume not, but are you certain the handlebar sleeve itself is not slipping?
I'll try the paste. It's not the sleeve, the whole thing is slipping/turning. Thanks!
cptsilver is offline  
Old 06-19-13, 11:19 AM
  #14  
rhm
multimodal commuter
 
rhm's Avatar
 
Join Date: Nov 2006
Location: NJ, NYC, LI
Posts: 19,694

Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...

Mentioned: 536 Post(s)
Tagged: 0 Thread(s)
Quoted: 1824 Post(s)
Liked 329 Times in 217 Posts
Well, it looks like you're doing everything right. I'm pretty sure your handlebar and stem are both 25.4 mm and you have plenty of room to tighten the clamp. Is the bolt stripped or something?
rhm is offline  
Old 06-19-13, 11:23 AM
  #15  
cptsilver
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SoCal
Posts: 147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by rhm View Post
Well, it looks like you're doing everything right. I'm pretty sure your handlebar and stem are both 25.4 mm and you have plenty of room to tighten the clamp. Is the bolt stripped or something?
Bolt is not stripped. I've turned the bolt as much as I can. Maybe I should try cleaning the surfaces to make sure there's no residue acting as a lubricant? It looks and feels pretty clean though...
cptsilver is offline  
Old 06-19-13, 11:25 AM
  #16  
rhm
multimodal commuter
 
rhm's Avatar
 
Join Date: Nov 2006
Location: NJ, NYC, LI
Posts: 19,694

Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...

Mentioned: 536 Post(s)
Tagged: 0 Thread(s)
Quoted: 1824 Post(s)
Liked 329 Times in 217 Posts
Maybe the end of the bolt is bottoming out in the threaded hole? If that's the case, you should be able to grind a little off the end and that'll solve the problem.
rhm is offline  
Old 06-19-13, 12:18 PM
  #17  
afilado
Senior Member
 
afilado's Avatar
 
Join Date: Jul 2007
Location: Chattanooga
Posts: 1,169

Bikes: '93 Bridgestone RB-1, '91 Specialized Allez Epic, '85 Raleigh Team Pro, '78 Andre Bertin, early '90s F. Moser Leader AX , '85 Centurion Equipe, '98 Litespeed Tuscany, '89 Klein Quantum, '80 Nishiki Superbe, '83 Peckham, '84 Fuji Opus III

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 11 Times in 8 Posts
....Or add a washer or two under the head......

J

Originally Posted by rhm View Post
Maybe the end of the bolt is bottoming out in the threaded hole? If that's the case, you should be able to grind a little off the end and that'll solve the problem.
afilado is offline  
Old 06-19-13, 12:52 PM
  #18  
Zinger
Trek 500 Kid
 
Zinger's Avatar
 
Join Date: Feb 2013
Location: Spokane WA
Posts: 2,564

Bikes: '83 Trek 970 road --- '86 Trek 500 road

Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 2568 Post(s)
Liked 174 Times in 139 Posts
Originally Posted by southpawboston View Post
Or get a piece of brass sheet stock for $2.50 from an art supply shop and cut out a shim. Adds some bling at the same time:



There ya go. Perfecto
Zinger is offline  
Old 06-19-13, 01:16 PM
  #19  
20grit
Curmudgeon in Training
 
20grit's Avatar
 
Join Date: May 2009
Location: Rural Retreat, VA
Posts: 1,962

Bikes: 1974 Gazelle Champion Mondial, 2010 Cannondale Trail SL, 1988 Peugeot Nice, 1992ish Stumpjumper Comp,1990's Schwinn Moab

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Likes: 0
Liked 6 Times in 5 Posts
Bolt is bottomed out and not allowing you to tighten it all the way.
I have 2 nearly identical 3ttt stems, each one came with a bolt. The bolt from one won't work with the other. It bottoms out and causes the exact problem you describe.
20grit is offline  
Old 06-19-13, 01:18 PM
  #20  
repechage
Senior Member
 
Join Date: Jun 2006
Posts: 16,109
Mentioned: 109 Post(s)
Tagged: 0 Thread(s)
Quoted: 1959 Post(s)
Liked 798 Times in 618 Posts
Double check that the bar is not deformed adjacent to the bar clamp bolt. Plenty of gorilla mechanics out there.
Ease all tension off the bolt, grease bar, slide over the grease, feel the shape of the bar.
If any undulation is detectable where the stem was clamped, time for a new handlebar.
repechage is offline  
Old 06-19-13, 01:38 PM
  #21  
Phil_gretz
Journeyman Bike Commuter
 
Phil_gretz's Avatar
 
Join Date: Aug 2009
Location: Alexandria, VA
Posts: 6,803

Bikes: '79 Peugeot PXN10LE, '88 Fuji Saratoga, '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '16 Motobecane Gran Premio Elite, '18 Velobuild VB-R-022, '21 Tsunami SNM-100

Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 1360 Post(s)
Liked 1,302 Times in 700 Posts
Good feedback. It might be that the bolt originally had a thin washer that prevented it from bottoming out. It's a relatively easy thing to check. A suitable washer would have to fit within the recess for the bolt head, though. Or use a cut-off wheel on a rotary tool, and trim off ~1 thread from the bolt...
Phil_gretz is online now  
Old 06-19-13, 01:46 PM
  #22  
ColonelJLloyd 
Senior Member
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Posts: 8,382
Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 110 Post(s)
Liked 6 Times in 5 Posts
Yes, there would have been a washer under the bolt head originally.
__________________
Bikes on Flickr
I prefer email to private messages. You can contact me at justinhughes@me.com
ColonelJLloyd is offline  
Old 06-21-13, 12:45 PM
  #23  
cptsilver
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SoCal
Posts: 147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks to all. I cleaned up both surfaces real good, and found a small washer that fit. It's all good now.
cptsilver is offline  
Old 06-21-13, 05:37 PM
  #24  
Scooper
Decrepit Member
 
Scooper's Avatar
 
Join Date: Aug 2005
Location: Santa Rosa, California
Posts: 10,489

Bikes: Waterford 953 RS-22, several Paramounts

Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 625 Post(s)
Liked 45 Times in 38 Posts
Yaay!! I love success stories.
__________________
- Stan

my bikes

Science doesn't care what you believe.
Scooper is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
sake
Bicycle Mechanics
10
09-27-12 04:46 AM
Don Taye
Classic and Vintage Bicycles: Whats it Worth? Appraisals.
5
08-07-12 12:24 AM
Tony Pham
Bicycle Mechanics
10
12-01-10 04:08 PM
ClarkinHawaii
Bicycle Mechanics
5
10-20-10 08:39 AM
stien
Classic & Vintage
8
07-20-10 07:35 AM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.