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

Shimano Downtube Levers on Threaded Rod

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.

Shimano Downtube Levers on Threaded Rod

Old 10-15-21, 10:19 AM
  #1  
johnggold
Senior Member
Thread Starter
 
Join Date: Aug 2015
Location: Midlands
Posts: 81

Bikes: Hetchins, Dawes, Raleigh, Standard Cycle Co, and others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 6 Times in 2 Posts
Shimano Downtube Levers on Threaded Rod

I am restoring a Viking bike, which has twin Shimano downtube levers and a couple of bits missing. I contacted Shimano, and the parts are no longer on their database. They stop at 2004.

There are no part nos on the levers, and the downtube is 41mm in diameter with a threaded rod through the downtube.

One side has all the bits, the other side is missing the part that goes on the threaded rod, and the plastic part which jams to the tube. The frame is in good paint condition so braze on lugs are not viable.

I cant find a circlip replacement for such a wide tube.

Ideas welcome.
johnggold is offline  
Old 10-15-21, 11:33 AM
  #2  
rccardr 
aka: Dr. Cannondale
 
rccardr's Avatar
 
Join Date: Jul 2009
Posts: 6,627

Bikes: Lots. Just...lots.

Mentioned: 187 Post(s)
Tagged: 0 Thread(s)
Quoted: 1590 Post(s)
Liked 1,054 Times in 500 Posts
Pictures, please.
Have some older Cannondale bits that might help you out.
__________________
Hard at work in the Secret Underground Laboratory...
rccardr is offline  
Likes For rccardr:
Old 10-16-21, 07:19 AM
  #3  
Bianchigirll 
Bianchi Goddess
 
Bianchigirll's Avatar
 
Join Date: Apr 2009
Location: Shady Pines Retirement Fort Wayne, In
Posts: 27,678

Bikes: Too many to list here check my signature.

Mentioned: 146 Post(s)
Tagged: 2 Thread(s)
Quoted: 2061 Post(s)
Liked 932 Times in 568 Posts
Originally Posted by johnggold View Post
I am restoring a Viking bike, which has twin Shimano downtube levers and a couple of bits missing. I contacted Shimano, and the parts are no longer on their database. They stop at 2004.

There are no part nos on the levers, and the downtube is 41mm in diameter with a threaded rod through the downtube.

One side has all the bits, the other side is missing the part that goes on the threaded rod, and the plastic part which jams to the tube. The frame is in good paint condition so braze on lugs are not viable.

I cant find a circlip replacement for such a wide tube.

Ideas welcome.
Assuming we are talking an Aluminum frame, the shifter bosses are held on most be the mentioned threaded rod. They would be provided by frame builder.

pictures would help tremendously




If you’re using using Shimano index shifters you need this backing plate to mate the shifter with the frame.
__________________
One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"

Sugar "Kane" Kowalczyk
Bianchigirll is offline  
Old 10-17-21, 08:37 AM
  #4  
johnggold
Senior Member
Thread Starter
 
Join Date: Aug 2015
Location: Midlands
Posts: 81

Bikes: Hetchins, Dawes, Raleigh, Standard Cycle Co, and others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 6 Times in 2 Posts
I am attaching a photo of the parts that I have. There is a part number SL-SY20A, which hasallowed me to see the same levers used on the opt tube, but the levers are mounted differently on a circlip.

Item 0 is the. I made this sketch looking at an image of SL-SY210A. It would have a threaded bolt to bolt into piece 3.

Item 1 is the friction lever. I think it would have a plate with grip mouldings on the inner surface similar to that on the indexed lever.

Item 2 is the threaded rod. A bit rusty but it does not look to be broken.

Then there is the boss that that the indexed lever rotates on. I think I need another one for the friction side

Item 4 is the indexed shifter, item 5 is the bolt that fixes it to the boss.

I suspect that I will not manage to source the parts, but end up replacing the shifters, but I can't find a circlip that allows a 41mm diameter tube. Either a circlip with two bosses standard, or a double cable clip so I can route the outer cables to the handlebars.

I really dont want to use a braze on as this will ruin the paint.
johnggold is offline  
Old 10-17-21, 07:10 PM
  #5  
1simplexnut
Senior Member
 
1simplexnut's Avatar
 
Join Date: Jul 2014
Location: New Zealand
Posts: 675

Bikes: 1963? Anquetil , 1973 PX10,1979 PX10,1984 PX10, VITUS 979 PX10DU,1970S ALAN,1985 PSV10,1980s PY10FC,1978 bERTIN,ALAN carbon

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 125 Post(s)
Liked 221 Times in 100 Posts
Might be easier to use some other levers for the missing bits ?
I see there was an offer earlier in the thread of some parts .
I have some bits in the shed that would work .
Unfortunately I am on the other side of the world ho hum .

Also "circlip" is not the right term .


external circlip
1simplexnut is offline  
Old 10-18-21, 06:38 AM
  #6  
Bianchigirll 
Bianchi Goddess
 
Bianchigirll's Avatar
 
Join Date: Apr 2009
Location: Shady Pines Retirement Fort Wayne, In
Posts: 27,678

Bikes: Too many to list here check my signature.

Mentioned: 146 Post(s)
Tagged: 2 Thread(s)
Quoted: 2061 Post(s)
Liked 932 Times in 568 Posts
Where did those shifters come from? They look like lowend thumb shifters that were never meant to be a downtube.

do you a pic of the shifter bosses on the bike?
__________________
One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"

Sugar "Kane" Kowalczyk
Bianchigirll is offline  
Old 10-18-21, 12:52 PM
  #7  
johnggold
Senior Member
Thread Starter
 
Join Date: Aug 2015
Location: Midlands
Posts: 81

Bikes: Hetchins, Dawes, Raleigh, Standard Cycle Co, and others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 6 Times in 2 Posts
Originally Posted by Bianchigirll View Post
Where did those shifters come from? They look like lowend thumb shifters that were never meant to be a downtube.

do you a pic of the shifter bosses on the bike?
There are no bosses. That's the whole point of the joining threaded rod. If I had bosses, I would be finding something else to fit them. When I was given the bike to fix they were already off the downtube, hanging loose from the cables.

I guess that the frame makers reused the levers with the threaded rod because the top tube fitted a much smaller diameter than 41mm.
johnggold is offline  
Old 10-18-21, 12:54 PM
  #8  
johnggold
Senior Member
Thread Starter
 
Join Date: Aug 2015
Location: Midlands
Posts: 81

Bikes: Hetchins, Dawes, Raleigh, Standard Cycle Co, and others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 6 Times in 2 Posts
Since so many parts I order come from the Far East, distance is no longer a barrier.

Please send photos of what you thik might work.

Thanks.
johnggold is offline  
Old 10-18-21, 03:25 PM
  #9  
clubman 
Youngman Grand
 
clubman's Avatar
 
Join Date: Jan 2010
Location: Nova Scotia
Posts: 7,721

Bikes: roadsters, club bikes, fixed and classic

Mentioned: 109 Post(s)
Tagged: 0 Thread(s)
Quoted: 1886 Post(s)
Liked 1,054 Times in 708 Posts
Just google Cannondale threaded shifter boss as an image search. Other aluminum and perhaps carbon fiber frames use the a similar approach.
clubman is offline  
Old 10-25-21, 04:12 AM
  #10  
johnggold
Senior Member
Thread Starter
 
Join Date: Aug 2015
Location: Midlands
Posts: 81

Bikes: Hetchins, Dawes, Raleigh, Standard Cycle Co, and others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 6 Times in 2 Posts
Originally Posted by clubman View Post
Just google Cannondale threaded shifter boss as an image search. Other aluminum and perhaps carbon fiber frames use the a similar approach.
Googling Cannondale came up with a USA dealer, at cycle-frames.com who should have a solution for me.
johnggold is offline  

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.