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


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-26-11, 01:51 PM   #1
Pars 
Senior Member
Thread Starter
 
Pars's Avatar
 
Join Date: Jan 2008
Location: Aurora, IL
Bikes: '73 Raleigh RRA, 1986 Trek 500 commuter
Posts: 2,356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Campy top tube cable clip screws?

The Campy 649 brake cable clips... anyone know what the screw threading is on these? I was going to replace the screws on mine with some stainless, but can't figure out the threading. Not M3, not 4-40. The thread looks to be a bit coarser in pitch than an M3, but about the same diameter. The hardware store I was at did not have any M3.5.

From old catalogs, they show the nut as a separate piece, but mine are captive. I'm not sure I've ever seen any that aren't. I posted this on C&V, but no one seemed to know.
Pars is offline   Reply With Quote
Old 03-26-11, 02:58 PM   #2
Steve530
Senior Member
 
Join Date: Jul 2008
Location: Knoxville, TN
Bikes: Klein
Posts: 911
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I can't help, but I agree those are a strange size. If they are M3.5, they'll be hard to find, especially in stainless. Have you tried taking one to a bolt supply store?
Steve530 is offline   Reply With Quote
Old 03-26-11, 03:45 PM   #3
dedhed
SE Wis
 
dedhed's Avatar
 
Join Date: Apr 2005
Location: Milwaukee, WI
Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400
Posts: 3,079
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
If it's m3.5 there are some out there.

http://www.microfasteners.com/catalo...s/METMSPPS.cfm
dedhed is offline   Reply With Quote
Old 03-26-11, 03:53 PM   #4
Pars 
Senior Member
Thread Starter
 
Pars's Avatar
 
Join Date: Jan 2008
Location: Aurora, IL
Bikes: '73 Raleigh RRA, 1986 Trek 500 commuter
Posts: 2,356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Thanks. Yes, I know a number of places that I can order M3.5 from, but wanted to confirm the threading before I did so.
Pars is offline   Reply With Quote
Old 03-26-11, 05:13 PM   #5
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,830
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 859 Post(s)
Why bother trying to identify the size. Bring the clip to the hardware store and have at it trial and error. Whatever fits is right, but 3 of them.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 03-26-11, 08:49 PM   #6
Pars 
Senior Member
Thread Starter
 
Pars's Avatar
 
Join Date: Jan 2008
Location: Aurora, IL
Bikes: '73 Raleigh RRA, 1986 Trek 500 commuter
Posts: 2,356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
That is what I did (took one of the screws to the hardware store). Nothing they had fit (M3, 4-40, etc.) Since nothing they had fit, I have to resort to figuring out what it is unless I want to order anything possible. In this case it would seem to either be down to M3.5 or it is something with an odd pitch or whatever. The screw would start just a touch in an M3 nut... almost like it is the correct diameter but a coarser thread pitch.
Pars is offline   Reply With Quote
Old 03-26-11, 08:59 PM   #7
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,830
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 859 Post(s)
OK. I assume you still have a screw from one of the other clamps. Start with a ruler and count the threads over an interval, both metric and inch, and get a good estimate of the pitch. If you have a caliper you can get a diameter and see it it's metric or inch.

With the pitch and major diameter, see if you can find a near match among the threads listed here Be aware that you may not have precise measurements, so if you find something that seems close, that's probably it.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 03-26-11, 09:47 PM   #8
aixaix 
car guy, recovering
 
aixaix's Avatar
 
Join Date: Nov 2008
Location: Mount Vernon, NY
Bikes: Olympia Competizione & Special Piuma, Frejus track circa 1958, Dahon Helios, many others
Posts: 1,245
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
They are 3.0mm diameter, and the pitch and diameter are the same as a Campy drop-out adjusting screw. I don't have a pitch gauge here, or I would check them. I think they are .8
__________________
Michael Shiffer
EuroMeccanicany.com
aixaix is offline   Reply With Quote
Old 03-26-11, 09:54 PM   #9
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,830
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 859 Post(s)
Quote:
Originally Posted by aixaix View Post
They are 3.0mm diameter, and the pitch and diameter are the same as a Campy drop-out adjusting screw. I don't have a pitch gauge here, or I would check them. I think they are .8
Definitely nor .8 which is the same as a water bottle screw 5x.8, but if it's 3mm it's likely an M3 coarse with a .5mm pitch (3x.5mm).
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 03-26-11, 10:03 PM   #10
Steve530
Senior Member
 
Join Date: Jul 2008
Location: Knoxville, TN
Bikes: Klein
Posts: 911
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have a Lambert from the early '70s with top tube brake cable clips. They are copies of the Campy clips, although I do not know if the bolts are the same. THe bike did have some odd parts.

Anyway, I removed one of the clips and measured the bolt. The major diameter is 0.107 inches, which is about 2.75 mm. If I counted correctly, the pitch is 40 tpi or 0.63 mm. So, I checked the bolt charts and the bolt is smaller than a M3. I tried a M3 which will just start in the nut, but only about one turn. The bolt is not as large as a 4-40, but the pitch is almost correct.

Recently, I put the Lambert back together for trainer duty. I found I had lost one of those clip screws. IIRC, I managed to force a 4-40 screw in the nut. That might work for you if you need to replace the bolts. I also noticed that Campyoldy has a set of 3 clips for about $20.

Good luck.

Edit: After reading aixaix's post, disregard this post if a M3 bolt will go through the non-nutted side of the clamp.

Last edited by Steve530; 03-26-11 at 10:14 PM.
Steve530 is offline   Reply With Quote
Old 03-27-11, 07:39 AM   #11
cranky old road
Let your bike be the tool
 
cranky old road's Avatar
 
Join Date: Jun 2006
Location: NC/SC border
Bikes: '66 Raleigh Carlton, '70 Ron Cooper, '95 Bianchi CD'I, Zonal Frame with Xenon gruppo, Carbon Frame with Record Gruppo, Columbia Twosome, Terry Classic, Bianchi SX, Gravity SS/FG
Posts: 820
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you're talking the 70's era part, I measured mine at (within my sem) 3 x 0.6. You might try posting the question to the C&V subforum.
cranky old road is offline   Reply With Quote
Old 03-27-11, 10:14 AM   #12
Pars 
Senior Member
Thread Starter
 
Pars's Avatar
 
Join Date: Jan 2008
Location: Aurora, IL
Bikes: '73 Raleigh RRA, 1986 Trek 500 commuter
Posts: 2,356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
They measure 3.06mm according to my calipers. I haven't counted threads yet. A 4-40 will thread into them, but is loose. Might work though, as they will tighten up. I have the original screws (have been using these for 30+ years), so will go with them if I can't find anything else. I will probably buy a spare set of these (and a 626 cable guide) as they do tend to break over time from flexing to go over the tubes.
Pars is offline   Reply With Quote
Old 03-27-11, 11:04 AM   #13
Steve530
Senior Member
 
Join Date: Jul 2008
Location: Knoxville, TN
Bikes: Klein
Posts: 911
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Always good to have a few spares, but I bet the originals will last another 30 years.
Steve530 is offline   Reply With Quote
Old 03-28-11, 09:48 AM   #14
aixaix 
car guy, recovering
 
aixaix's Avatar
 
Join Date: Nov 2008
Location: Mount Vernon, NY
Bikes: Olympia Competizione & Special Piuma, Frejus track circa 1958, Dahon Helios, many others
Posts: 1,245
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The screws are 3mm .5 pitch.
__________________
Michael Shiffer
EuroMeccanicany.com
aixaix is offline   Reply With Quote
Old 03-28-11, 11:44 AM   #15
Pars 
Senior Member
Thread Starter
 
Pars's Avatar
 
Join Date: Jan 2008
Location: Aurora, IL
Bikes: '73 Raleigh RRA, 1986 Trek 500 commuter
Posts: 2,356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
^ Hmmm. A std. M3 at a hardware store should be coarse (not fine), which is 3mm x 0.5mm pitch I think? I'll have to take a clip in and try a screw rather than trying one of my screws in a nut. Perhaps the nut I tried had gotten mixed up. The display thing they have for checking threading did not go below M4 (or 6x32 for US).
Pars is offline   Reply With Quote
Old 03-28-11, 03:03 PM   #16
aixaix 
car guy, recovering
 
aixaix's Avatar
 
Join Date: Nov 2008
Location: Mount Vernon, NY
Bikes: Olympia Competizione & Special Piuma, Frejus track circa 1958, Dahon Helios, many others
Posts: 1,245
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
For what it's worth, drop-out screws and Campy N.R. (and likely many other) derailleur limit screws are the same size & pitch. Of course, I am assuming that the Campagnolo cable strap screw I measured (owned since new, BTW) is the same as yours. McMaster.com should have what you are looking for, though you might end up with 22 spares!
__________________
Michael Shiffer
EuroMeccanicany.com
aixaix is offline   Reply With Quote
Old 03-28-11, 03:12 PM   #17
Pars 
Senior Member
Thread Starter
 
Pars's Avatar
 
Join Date: Jan 2008
Location: Aurora, IL
Bikes: '73 Raleigh RRA, 1986 Trek 500 commuter
Posts: 2,356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Unfortunately (?), my bike has Campy vertical dropouts, so I can't check that. I'll take a clip to another hardware store and check their M3s.
Pars is offline   Reply With Quote
Old 03-28-11, 06:34 PM   #18
tanguy frame
Senior Member
 
tanguy frame's Avatar
 
Join Date: May 2005
Location: Portland, OR metro area
Bikes:
Posts: 976
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
is there a source for Campy drop out adjusting screws? Mine are bent.
tanguy frame is offline   Reply With Quote
Old 03-28-11, 07:11 PM   #19
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,830
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 859 Post(s)
Quote:
Originally Posted by tanguy frame View Post
is there a source for Campy drop out adjusting screws? Mine are bent.
For originals try yellow.jersey.org or Branford Bike. Otherwise buy the longest 3x.5 screws you can find and even if they don't reach through you can adjust them from the axle side and once set they'll stay put.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 03-28-11, 07:52 PM   #20
Steve530
Senior Member
 
Join Date: Jul 2008
Location: Knoxville, TN
Bikes: Klein
Posts: 911
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Pars View Post
^ Hmmm. A std. M3 at a hardware store should be coarse (not fine), which is 3mm x 0.5mm pitch I think? I'll have to take a clip in and try a screw rather than trying one of my screws in a nut. Perhaps the nut I tried had gotten mixed up. The display thing they have for checking threading did not go below M4 (or 6x32 for US).
Find a Fastenall store. They have M3 in stainless and sell the bolts by the piece. I bought a few to replace the limit socket head screws on my Campy front derailleur limit screws.
Steve530 is offline   Reply With Quote
Old 03-29-11, 12:58 PM   #21
Pars 
Senior Member
Thread Starter
 
Pars's Avatar
 
Join Date: Jan 2008
Location: Aurora, IL
Bikes: '73 Raleigh RRA, 1986 Trek 500 commuter
Posts: 2,356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
^ Thanks for jogging my memory, I'd forgotten about those places (Fastenal). Went to one at lunch today, and while they didn't have any M3 in stock to try, he tried the screw in his threaded thread gauge and it would not even start. On the thread pitch gauge he had, it was closest to the .7mm pitch (gauge did not go any finer than that). It did fit a 5-40 though, so I had him order some stainless button allen head ones which will be there tomorrow.
Pars is offline   Reply With Quote
Old 03-29-11, 02:33 PM   #22
tanguy frame
Senior Member
 
tanguy frame's Avatar
 
Join Date: May 2005
Location: Portland, OR metro area
Bikes:
Posts: 976
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by FBinNY View Post
For originals try yellow.jersey.org or Branford Bike. Otherwise buy the longest 3x.5 screws you can find and even if they don't reach through you can adjust them from the axle side and once set they'll stay put.
Yikes! $25!!!
Gotta love Campy!
Attached Images
File Type: jpg 301'302.jpg (90.9 KB, 6 views)
tanguy frame is offline   Reply With Quote
Old 03-29-11, 03:21 PM   #23
Steve530
Senior Member
 
Join Date: Jul 2008
Location: Knoxville, TN
Bikes: Klein
Posts: 911
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Pars View Post
^ Thanks for jogging my memory, I'd forgotten about those places (Fastenal). Went to one at lunch today, and while they didn't have any M3 in stock to try, he tried the screw in his threaded thread gauge and it would not even start. On the thread pitch gauge he had, it was closest to the .7mm pitch (gauge did not go any finer than that). It did fit a 5-40 though, so I had him order some stainless button allen head ones which will be there tomorrow.
Fastenal is a great place to look for that kind of stuff.

Who would have thoguht a 5-40 would fit. Just a little larger than 3mm.
Steve530 is offline   Reply With Quote
Old 03-30-11, 08:01 PM   #24
Pars 
Senior Member
Thread Starter
 
Pars's Avatar
 
Join Date: Jan 2008
Location: Aurora, IL
Bikes: '73 Raleigh RRA, 1986 Trek 500 commuter
Posts: 2,356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Got the screws today (stainless hex button head) and they fit fine, go figure. I wouldn't recommend that anyone assume theirs also take 5-40. These came with the brakes from an LBS back in the early '70s, probably '74, and are chrome plated, not the later stainless steel that I believe they switched to. Thanks for all the helpful comments.
Pars 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 02:36 PM.