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 12-21-01, 12:04 AM   #1
Bobsled
Senior Member
Thread Starter
 
Bobsled's Avatar
 
Join Date: Dec 2001
Location: Downey, CA.
Bikes: Litespeed Classic (55cm), Specialized Tarmac Pro (56cm)
Posts: 1,147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Shimano brake adjustment.

New to shimano so I need help with this one. Park makes an offset adjustment wrench for Campy brakes so that when they're all tighten down and they end up being offset (closer to one side of the rim than the other) you just take your offset wrench and center the brake calipers without having to loosen it because the force of tightening them almost always leaves them un-centered. Anyway, my question is can you do this with shimano brakes (ultegra) too and who makes a tool for this (already visited Parktool.com and couldn't find any)?
__________________
Litespeed, lasts a lifetime.

Specialized Tarmac, lasts a lifetime, or until it breaks.
Bobsled is offline   Reply With Quote
Old 12-21-01, 03:05 AM   #2
Geronimo
Senior Member
 
Join Date: Dec 2001
Location: Southwest VA
Bikes:
Posts: 56
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
are they the Ultegra dual pivot brakes? the set screw on top of the middle piece of arm (hard to describe) will adjust the spring tension and help to center the brake arms. You can also take them loose and do the gross centering, retighten, and use the set screw to fine tune. Shimano's Euro site has much better tech info than the US site.

http://www.shimano-europe.com/cyclin...20%28EN%29.pdf

see step 4

hope this helps
Geronimo is offline   Reply With Quote
Old 12-22-01, 12:37 PM   #3
RainmanP
Mr. Cellophane
 
RainmanP's Avatar
 
Join Date: Nov 2000
Location: New Orleans, LA
Bikes:
Posts: 3,037
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bobsled,
I am nut sure about Ultegra, but I'll tell you about my two different sets of different vintage 105 brakes. One set, that are, I believe, 8-speed, has the screw I think Geronimo is describing. A small philips head screw out at the corner on the opposite side from where the brake cable attaches. That is the fine centering adjustment. The other set on a 12 speed from the late 80s has kind of a conical 12 mm hex (outide hex, not Allen head). This is the head of the mounting bolt, but is only an incidental part of the mounting system. According to older repair manuals you use it to adjust the centering by putting a wrench on it and turning the whole mechanism by rotating the bolt. Easy does it, you only need to move it a little. With this setup you don't need to loosen the mounting bolt. I'm not sure if I am doing a good job of describing it. Let me know if you think you have this type of setup and need more guidance. This type can be confusing because the single mounting bolt, a nut and a treaded sleeve type of mounting nut are actually fulfilling three different functions - appropriate tension controlling the brake arm pivot, centering, and mounting the brake mechanism. Each function needs proper adjustment for the brakes to work well.

Mike and others, have I described this more or less correctly? I only recently began to understand how this type of brake mechanism goes together and works, and I'm still not sure I fully understand.
Regards,
Raymond
__________________
If it ain't broke, mess with it anyway!
RainmanP is offline   Reply With Quote
Old 12-22-01, 07:03 PM   #4
Bobsled
Senior Member
Thread Starter
 
Bobsled's Avatar
 
Join Date: Dec 2001
Location: Downey, CA.
Bikes: Litespeed Classic (55cm), Specialized Tarmac Pro (56cm)
Posts: 1,147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks guys. I'm not sure if it's dual pivot. It's a 2001 model so I would think it is (isn't that the only way they make them?). Anyway, they have (adjustment) screws everywhere. I'll try your recommendations then read the owner's manual if those fail. The shop I bought the bike from was good enough to hand them all over to me.
__________________
Litespeed, lasts a lifetime.

Specialized Tarmac, lasts a lifetime, or until it breaks.
Bobsled is offline   Reply With Quote
Old 12-26-01, 07:28 PM   #5
Bike Spokesman
Senior Member
 
Bike Spokesman's Avatar
 
Join Date: Dec 2001
Location: Toronto Canada
Bikes:
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A 2001 brake will definately be dual pivot, and if you look at the third piece in the brake construction from above, the adjustment screw should be right on the middle peice.

Good luck
Bike Spokesman is offline   Reply With Quote
Old 12-27-01, 11:49 PM   #6
Bobsled
Senior Member
Thread Starter
 
Bobsled's Avatar
 
Join Date: Dec 2001
Location: Downey, CA.
Bikes: Litespeed Classic (55cm), Specialized Tarmac Pro (56cm)
Posts: 1,147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BS,

That did the trick. Thanks all.
__________________
Litespeed, lasts a lifetime.

Specialized Tarmac, lasts a lifetime, or until it breaks.
Bobsled 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 01:27 AM.