Retrobike Forum Index

It is currently Tue Dec 06, 2016 1:15 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 12 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Shimano Dura-Ace stem
PostPosted: Sun Dec 06, 2009 2:13 pm 
Retro Guru
User avatar

Joined: Thu Aug 06, 2009 5:48 pm
Posts: 868
Hi,

I recently picked up a Dura-Ace stem. It's the same as this:

Image

^ That's actually an Ultegra stem but the one I have is identical.

Unfortunately the expander wedge/bolt is missing and appears to be proprietary.

Image

I thought about getting a bolt and drilling out a wedge as it is slightly wider than a standard expander bolt. Thing is, I can't find a bolt that fits. Just wondered if anyone had any info or ideas, short of getting another Shimano stem I don't know what to do with it.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Dec 06, 2009 4:13 pm 
Old School Hero
User avatar

Joined: Tue Oct 13, 2009 3:08 pm
Posts: 240
I thought the 600 had the wedge expander and the Dura Ace had the plug ( it looks like it in the instruction pamphlet too ). I have a 600 from June 87 ( date code KF ) that has the wedge and a Dura Ace from Aug 1986 ( JH ) that has the plug ( see below ). What date code is on your stem ?

The expander bolt on the Dura Ace has a left hand thread on both ends.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Sun Dec 06, 2009 4:41 pm 
Retro Guru
User avatar

Joined: Thu Aug 06, 2009 5:48 pm
Posts: 868
Maybe it's a 600 stem then. I'm pretty sure it says Dura-Ace on it but I don't have it in front of me. It definitely needs a wedge and not a plug.

But if it is a left hand thread that would explain why I can't find a bolt that fits so thanks for the info. I'll have to have a good look at it.

Edit: Just had a look and you're right, it is a 600. It's an older one that's engraved 600 AX. It doesn't look reverse threaded but I'm not 100%.


Last edited by beagle on Sun Dec 06, 2009 4:56 pm, edited 2 times in total.

Top
 Profile  
 
 Post subject:
PostPosted: Sun Dec 06, 2009 4:54 pm 
Retro Guru

Joined: Sun Mar 01, 2009 2:49 pm
Posts: 2579
Location: Boiling in a Bivvy Bag
Probably of no use at all, but here are some detailed pics -http://www.flickr.com/photos/stronglight/sets/72157604999952452/

These stems are superbly engineered, many consider them the finest quill stem ever..

I thought only the Ultegra version used a standard wedge, with the Dura Ace using an expander 'cone'? The 'wedge' would be much easier to improvise than the 'cone' but sourcing that bolt is gonna be tricky. To be honest I don't think there's much chance of bodging the bolt yourself as it's such a fiddly little thing with two different diameter threaded ends and that allen key fitting (see pic).. Unless you can come up with something much simpler...

Edit -sorry hadn't seen above reply.. link isn't working either. :roll:


Top
 Profile  
 
 Post subject:
PostPosted: Sun Dec 06, 2009 4:59 pm 
Retro Guru

Joined: Sun Mar 01, 2009 2:49 pm
Posts: 2579
Location: Boiling in a Bivvy Bag
Here -
http://www.flickr.com/photos/strongligh ... 999952452/


Top
 Profile  
 
 Post subject:
PostPosted: Sun Dec 06, 2009 5:01 pm 
Retro Guru
User avatar

Joined: Thu Aug 06, 2009 5:48 pm
Posts: 868
ferrus wrote:
Probably of no use at all, but here are some detailed pics -http://www.flickr.com/photos/stronglight/sets/72157604999952452/

These stems are superbly engineered, many consider them the finest quill stem ever..

I thought only the Ultegra version used a standard wedge, with the Dura Ace using an expander 'cone'? The 'wedge' would be much easier to improvise than the 'cone' but sourcing that bolt is gonna be tricky. To be honest I don't think there's much chance of bodging the bolt yourself as it's such a fiddly little thing with two different diameter threaded ends and that allen key fitting (see pic).. Unless you can come up with something much simpler...

Edit -sorry hadn't seen above reply..


I was thinking I could improvise something if I could find a bolt that fits. Maybe just get a regular bolt and tighten it from the bottom through the fork steerer.

Bit of a shame really, because as you say, they are very nice stems.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Dec 06, 2009 6:33 pm 
Old School Hero
User avatar

Joined: Tue Oct 13, 2009 3:08 pm
Posts: 240
I've just taken this off a 600 AX. The coarse thread is left handed. The wedge swivels on the narrower part and is held on with the nut.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Sun Dec 06, 2009 7:37 pm 
Retro Guru
User avatar

Joined: Thu Aug 06, 2009 5:48 pm
Posts: 868
Thanks a lot, Simplex. That's a massive help. Might be able to figure something out now I know what's what.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Dec 07, 2009 7:12 am 
Old School Grand Master

Joined: Sun Oct 21, 2007 2:33 am
Posts: 5487
Location: WI, USA
Had a 600 version just like it in my Panasonic Pics road bike back in 1989....wow that's 20 years ago.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Dec 07, 2009 12:11 pm 
Retro Guru

Joined: Sun Mar 01, 2009 2:49 pm
Posts: 2579
Location: Boiling in a Bivvy Bag
Well one thing I'll take from this is not to take mine apart, for fear of losing any of the proprietary bits! Have you seen all the fiddly parts in the bar clamp mechanism:

http://www.flickr.com/photos/strongligh ... 999952452/


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 32 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group