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 06-20-08, 10:21 AM   #1
balindamood 
Wrench Savant
Thread Starter
 
balindamood's Avatar
 
Join Date: Mar 2006
Location: 61 Degrees North
Bikes: www.2nd-cycles.com
Posts: 2,202
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Shimano RSX Brifters

Hi. I have two sets of older Shimano 7-speed 'brifters'. One does not down shift, the other does neither up or down shift (right side/rear). I REALLY do not want to 'upgrade' to a new Sora and would rather try to make at least one functioning lever out of the two. The levers will move like they are shifting, but no-clicky and not cable movement. They are both stuck in the 1st-gear (big cog) spot.

I have unscrewed the 5mm allen screw on the front of the lever so that the plate came off with the spring inside of it. I am now looking at what is a square-sided 6mm nut/bolt that the allen screw attached. The lever will not come off (easilly) and the nut does not turn (easilly).

Should I even be doing this (I figured I have nothing to loose), and how do I proceed in takling it apart to find the problem? Any ideas on what the problem might be?

Thanks!
__________________
"Where you come from is gone;
where you are headed weren't never there;
and where you are ain't no good unless you can get away from it."
balindamood is offline   Reply With Quote
Old 06-20-08, 12:16 PM   #2
bikeman715
Senior Member
 
bikeman715's Avatar
 
Join Date: Mar 2008
Location: Salinas , Ca.
Bikes: Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others
Posts: 2,436
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
your shifters are nonservicable even if you can get them apart you will not be able to put them back together again and beside you cannot get parts for them anyway . sorry. you have nothing to lose but time . it is a good learning lesson to do .
bikeman715 is offline   Reply With Quote
Old 06-20-08, 02:10 PM   #3
Exhand
Newbie
 
Join Date: Jul 2007
Bikes:
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I had similar symptoms (no resistance/engagement) when the temperature started to drop last fall. I was able to spray some lightweight grease into the lubrication holes (?) that are exposed with the brakes applied. This was enough to free up the internal mechanisms. I've only had to reapply once since then.
Exhand is offline   Reply With Quote
Old 06-20-08, 02:32 PM   #4
sonatageek
Senior Member
 
sonatageek's Avatar
 
Join Date: Oct 2006
Location: Cleveland,Ohio
Bikes:
Posts: 2,767
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I think there is a guy who refurbishes old Shimano brifters and sell them on E-bay. He might take old broken ones in on trade. Can't remember, but I seem to remember reading a listing to that effect at one time earlier this year.
__________________
My blog
http://radiocycles.wordpress.com/
sonatageek is offline   Reply With Quote
Old 06-20-08, 02:44 PM   #5
AndrewP
Senior Member
 
Join Date: Sep 2001
Location: Montreal
Bikes: Peugeot Hybrid, Minelli Hybrid
Posts: 6,521
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Clean the mechanism with a generous spray of WD-40.
AndrewP is offline   Reply With Quote
Old 06-20-08, 05:15 PM   #6
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by AndrewP View Post
Clean the mechanism with a generous spray of WD-40.
+1
It's worth a try.
Al1943 is offline   Reply With Quote
Old 06-20-08, 10:23 PM   #7
balindamood 
Wrench Savant
Thread Starter
 
balindamood's Avatar
 
Join Date: Mar 2006
Location: 61 Degrees North
Bikes: www.2nd-cycles.com
Posts: 2,202
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Well, I had some success. There is a 2mm allen screw on the brake pivot pin. I removed that, and then removed the pivot pin with a punch. This allowed me to unscrew the the phillips head behind the down shifter which then relaeses the brake lever.

Upon inspection of the mechanism, I figured out that the pawl which enguages the entire mechanism for up-shifting was full of solidified grease and was no longer springing properly. A blast and clease with WD-40, then oil, then greasing the ratchet mechanisms has resulted in it working as good as used. The whole thing, including re-assembly took about 40 minutes.

I can see if anything actually breaks or totally wears out, fixing it would be very difficult as it appears that the pawls and spring axles are a press fit into the shifter body. However, for just cleaning the bugger out, it is servicable.

If anyone has some more defunct RSX brifters, I'll take them as spares for when these finally explode.
__________________
"Where you come from is gone;
where you are headed weren't never there;
and where you are ain't no good unless you can get away from it."
balindamood is offline   Reply With Quote
Old 06-20-08, 10:46 PM   #8
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Bikes:
Posts: 7,979
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Quote:
Originally Posted by Al1943 View Post
+1
It's worth a try.
+1 1/2
It worked for me on my 10 year old XTR shifters. When the internal ratchets don't catch, it means the grease has gotten dried up and gummy. A clean out with some light spray lube usually fixes them.
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline   Reply With Quote
Old 06-21-08, 03:03 PM   #9
crocodilefundy
Senior Member
 
Join Date: Jun 2008
Bikes:
Posts: 411
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
how ironic is it that I'm stuck doing the same thing today... unfortunately it looks like the cable is stuck some how.
crocodilefundy is offline   Reply With Quote
Old 06-21-08, 03:08 PM   #10
FlatFender
Senior Member
 
FlatFender's Avatar
 
Join Date: Aug 2006
Location: Raleigh NC
Bikes:
Posts: 1,008
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by crocodilefundy View Post
how ironic is it that I'm stuck doing the same thing today... unfortunately it looks like the cable is stuck some how.
lol.... I actually just flushed out some old 7speed rsx brifters this week also! They went from completely non working, to working great. Im pretty stoked about it!
Make sure that the shifter is shifted all the way the correct way so you can remove the cable.
FlatFender is offline   Reply With Quote
Old 06-21-08, 04:01 PM   #11
crocodilefundy
Senior Member
 
Join Date: Jun 2008
Bikes:
Posts: 411
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yea. i did that. i got them out ...
crocodilefundy is offline   Reply With Quote
Old 06-22-08, 12:25 AM   #12
balindamood 
Wrench Savant
Thread Starter
 
balindamood's Avatar
 
Join Date: Mar 2006
Location: 61 Degrees North
Bikes: www.2nd-cycles.com
Posts: 2,202
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Paranoia thought for the day:

I wonder if Shimano uses grease which solidifies about the time the warranty runs out.
__________________
"Where you come from is gone;
where you are headed weren't never there;
and where you are ain't no good unless you can get away from it."
balindamood is offline   Reply With Quote
Old 06-22-08, 12:35 AM   #13
Wordbiker
Pwnerer
 
Wordbiker's Avatar
 
Join Date: Jun 2005
Location: Pagosa Springs, CO, USA
Bikes: Road, MTB, Cruiser, Chopper, BMX
Posts: 2,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by balindamood View Post
Paranoia thought for the day:

I wonder if Shimano uses grease which solidifies about the time the warranty runs out.
If so, that's brilliant engineering.
__________________
Quote:
Originally Posted by ahsposo View Post
Ski, bike and wish I was gay.
Wordbiker 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 01:19 PM.