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

26mm bars in an old cinelli 26.4mm stem?

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.

26mm bars in an old cinelli 26.4mm stem?

Old 08-25-10, 01:23 PM
  #1  
ph0ust
Junior Member
Thread Starter
 
Join Date: Mar 2006
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
26mm bars in an old cinelli 26.4mm stem?

hi. i've searched the forums and generally found only questions doing the inverse.

my '81 colnago superissimo has the original cinelli stem, which i understand should be 26.4mm. i want to replace the bars with something new, all of which would be 26mm in diameter.

my question is whether there would be an issue. i assume that the marginal difference would not pose any issue to the clamp on the stem.

any thoughts/experiences with this? thanks.
ph0ust is offline  
Old 08-25-10, 01:46 PM
  #2  
tatfiend 
Gear Hub fan
 
Join Date: Nov 2008
Location: Reno, NV
Posts: 2,829

Bikes: Civia Hyland Rohloff, Swobo Dixon, Colnago, Univega

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Nitto makes a shim pair to use 25.4mm bars in 26.0mm stems and it is widely used for that purpose. The Nitto shim material is .012" thick. A similar shim pair made of .008" material should work with the Cinelli stem. I would not use the stem w/o the shim on a 26.0mm bar as tightening it down could overstress it and the difference in radius between the bar and stem will likely put uneven pressure on the bar's clamp area while still not clamping it as firmly as normally wanted.
__________________
Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro

Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/
tatfiend is offline  
Old 08-25-10, 02:02 PM
  #3  
ColonelJLloyd 
Senior Member
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Posts: 8,371
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I would try fabricating a shim from an aluminum can, which I think is only slightly thinner than the Nitto shim. Just test it out in a relatively controlled environment. Don't wait until you're at the bottom of a steep descent to learn that your bars are going to slip forward.
ColonelJLloyd is offline  
Old 08-25-10, 02:22 PM
  #4  
red sox junkie
lurking. . . lurking. . .
 
Join Date: Dec 2006
Posts: 121
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
I would try fabricating a shim from an aluminum can, which I think is only slightly thinner than the Nitto shim. Just test it out in a relatively controlled environment. Don't wait until you're at the bottom of a steep descent to learn that your bars are going to slip forward.
This is what I did and it worked fine. In fact, I forgot I did it unitl I took the bike apart recently and the aluminum pieces came out.
red sox junkie is offline  
Old 08-25-10, 02:46 PM
  #5  
unworthy1
Stop reading my posts!
 
unworthy1's Avatar
 
Join Date: Sep 2004
Posts: 10,244
Mentioned: 43 Post(s)
Tagged: 0 Thread(s)
Quoted: 348 Post(s)
Likes: 0
Liked 15 Times in 15 Posts
Originally Posted by red sox junkie View Post
This is what I did and it worked fine. In fact, I forgot I did it unitl I took the bike apart recently and the aluminum pieces came out.
I have used the old beer can shim many times with success, except for this very same combo: an old 26.4 stem and a new 26.0 bar, both Cinelli...it slipped and was unreliable until I bought some real brass shim stock and used that. No idea why brass would be less slippery than aluminum, but it is. Maybe the paint or the coating/lining inside the can...anyhow, I'm sold on brass and have enough to do all the h-bars I'll ever own.
unworthy1 is offline  
Old 08-26-10, 08:20 AM
  #6  
ph0ust
Junior Member
Thread Starter
 
Join Date: Mar 2006
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
thanks everyone. i've since realized that my stem is just too long and has too much of a negative angle to it. i think i need to replace it. after playing with it, i thought new bars would help, but i'm pretty positive that the whole stem needs to get yanked.

any input on getting my bars pulled back and pushed up? are the old cinelli stems 1" or 1.125"? i'm thinking i may have to go with a stem adapter and a separate stem, that way i can get one very short with a positive angle to it.

any advice is appreciated!
ph0ust is offline  
Old 08-26-10, 10:18 AM
  #7  
unworthy1
Stop reading my posts!
 
unworthy1's Avatar
 
Join Date: Sep 2004
Posts: 10,244
Mentioned: 43 Post(s)
Tagged: 0 Thread(s)
Quoted: 348 Post(s)
Likes: 0
Liked 15 Times in 15 Posts
old Cinelli stems are all 1" quill, if you can't find something like a Nitto DirtDrop that's short enough, you'll have to go with a 1" Mtn bike stem or that quill adapter and a modern stem.
unworthy1 is offline  
Old 08-26-10, 10:21 AM
  #8  
ColonelJLloyd 
Senior Member
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Posts: 8,371
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by unworthy1 View Post
....if you can't find something like a Nitto DirtDrop that's short enough, you'll have to go with a 1" Mtn bike stem or that quill adapter and a modern stem.
I have a Nitto Technomic with a 60mm reach. I think they're available in a 50mm reach. The DirtDrop is a nice stem, but I don't like the aesthetics of stems that don't have a 73/17 angle on vintage bikes with horizontal top tubes.
ColonelJLloyd is offline  
Old 08-26-10, 01:23 PM
  #9  
SJX426 
Senior Member
 
SJX426's Avatar
 
Join Date: May 2008
Location: Fredericksburg, Va
Posts: 6,319

Bikes: '72 Motobecane Le Champion(totaled), '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Tre Cime, '91 Pinarello Montello, '94 Burley Duet, 97 Specialized RockHopper, 2010 Langster, Tern Link D8

Mentioned: 42 Post(s)
Tagged: 0 Thread(s)
Quoted: 468 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I too have a Superissimo. Tried various combinations due to the stem being too short for me. Ended up finding a 1A in 115 to meet my needs and settled on it. I did try the updated version but didn't stick to it. Bunch of pictures here: http://s985.photobucket.com/albums/a...20Superissimo/
SJX426 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
PigGirl
Blogger's Forum
0
08-17-09 07:44 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

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.