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 12-03-11, 07:57 AM   #1
Capecodder
Senior Member
Thread Starter
 
Capecodder's Avatar
 
Join Date: Jul 2010
Location: Somewhere Between The Beginning And The End
Bikes:
Posts: 1,994
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Brake Bridge Question

OK, this may be a stupid question, but is this bridge designed for fenders only, or is it safe to mount a center-pull caliper to it?

The bike has Canti's but no way do they have enough adjustment to allow for 700c wheels, but by mounting a center-pull caliper on the bridge there is plenty of adjustment.



Uploaded with ImageShack.us
Capecodder is offline   Reply With Quote
Old 12-03-11, 08:00 AM   #2
rhenning
Senior Member
 
Join Date: Apr 2006
Bikes:
Posts: 2,485
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
It should work fine for brakes. Roger
rhenning is online now   Reply With Quote
Old 12-03-11, 08:26 AM   #3
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta
Posts: 4,589
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 61 Post(s)
It should work fine. Just make sure you have the curved spacers for the brake mounting bolt to avoid crushing the bridge tube.
dsbrantjr is offline   Reply With Quote
Old 12-03-11, 08:55 AM   #4
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,852
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Also, depending on the hole diameter in the bridge you may need "external nutted" brakes instead of the newer recessed nutted brakes. If the hole is 6 mm on both sides you will need an external nut or you will have to enlarge the seattube side of the hole (and only that side) to 5/16" or 8 mm to accept the recessed nut.

Another alternative if you can only find recessed nut brakes is to use a front brake in the rear as it's center bolt is long enough to accept an external nut.
HillRider is offline   Reply With Quote
Old 12-03-11, 09:21 AM   #5
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,624
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 90 Post(s)
Quote:
Originally Posted by HillRider View Post
Also, depending on the hole diameter in the bridge you may need "external nutted" brakes instead of the newer recessed nutted brakes. If the hole is 6 mm on both sides you will need an external nut or you will have to enlarge the seattube side of the hole (and only that side) to 5/16" or 8 mm to accept the recessed nut.
Speaking of which, how'd you get such a nice clear photo from the seat tube side of the brake bridge?

To drill out the brake bridge, I clamp a drill bit with a vice grip and twist it back and forth by hand. It's more easily done than it sounds.
Retro Grouch is online now   Reply With Quote
Old 12-03-11, 09:36 AM   #6
Capecodder
Senior Member
Thread Starter
 
Capecodder's Avatar
 
Join Date: Jul 2010
Location: Somewhere Between The Beginning And The End
Bikes:
Posts: 1,994
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Retro Grouch View Post
Speaking of which, how'd you get such a nice clear photo from the seat tube side of the brake bridge?

To drill out the brake bridge, I clamp a drill bit with a vice grip and twist it back and forth by hand. It's more easily done than it sounds.
I just placed the camera in (Macro) and pressed the button LOL.... I think I got kucky.

The hole in the bridge is 6mm any suggestions on brake calipers? The rear needs to have about a 64mm reach. I was thinking of 70's Dia-Compe style center-pulls like these?



Uploaded with ImageShack.us

Last edited by Capecodder; 12-03-11 at 09:52 AM.
Capecodder is offline   Reply With Quote
Old 12-03-11, 09:55 AM   #7
catmandew52
Senior Member
 
catmandew52's Avatar
 
Join Date: Jul 2011
Location: S. E. Michigan
Bikes:
Posts: 517
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
If you want to keep canti's, maybe you should call VO. Their Grand Cru canti looks like it has a lot of adjustment.
Someone on VO's blog went from 26" mtb wheels to 650b on his surly using those canti's
Tektro CR720 might have enough adjustment also.
Also older Shimano BR MC70
LINK http://www.flickr.com/photos/stronglight/6032423553/
catmandew52 is offline   Reply With Quote
Old 12-03-11, 10:03 AM   #8
Capecodder
Senior Member
Thread Starter
 
Capecodder's Avatar
 
Join Date: Jul 2010
Location: Somewhere Between The Beginning And The End
Bikes:
Posts: 1,994
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by catmandew52 View Post
If you want to keep canti's, maybe you should call VO. Their Grand Cru canti looks like it has a lot of adjustment.
Someone on VO's blog went from 26" mtb wheels to 650b on his surly using those canti's
Tektro CR720 might have enough adjustment also.
Also older Shimano BR MC70
LINK http://www.flickr.com/photos/stronglight/6032423553/
I've tried every way possible and nothing will work. I'm not a big fan of Canti's anyhow.
Capecodder is offline   Reply With Quote
Old 12-03-11, 10:11 AM   #9
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,852
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Here's another brake that has the needed reach: http://www.tektro.com/_english/01_pr...e&sort=2&fid=9

They apparently come in both recessed and nutted versions.
HillRider is offline   Reply With Quote
Old 12-03-11, 11:07 AM   #10
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 19,730
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 466 Post(s)
I'd get a better brake to go on the existing bosses, you might find a shorter arm V brake OK

I've got Magura's hydraulic rim brakes on one bike , none better. Kool stop salmon compound pads

Plain post , Eagle Claw for what brake is on there.
fietsbob is offline   Reply With Quote
Old 12-03-11, 11:27 AM   #11
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,852
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Quote:
Originally Posted by fietsbob View Post
I'd get a better brake to go on the existing bosses, you might find a shorter arm V brake OK
Apparently the bosses are located too far from the new 700c rim to make the pad adjustment possible so no boss mounted brake is suitable.
HillRider is offline   Reply With Quote
Old 12-03-11, 11:31 AM   #12
catmandew52
Senior Member
 
catmandew52's Avatar
 
Join Date: Jul 2011
Location: S. E. Michigan
Bikes:
Posts: 517
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by Capecodder View Post
I've tried every way possible and nothing will work. I'm not a big fan of Canti's anyhow.
Thats what makes the world go round.
Tektro has a realllly long reach side pull,http://www.tektro.com/_english/01_pr...e&sort=2&fid=9
But if you want to use centerpulls as pictured you may might want to look at these extra long reach Dia-compe's http://sheldonbrown.com/harris/brake-calipers.html (they'll probably flex and might be noisy) or you could make some drop bolts ala Sheldon's design if you can't find anyone who still has a few laying around'

added
You might wind up having to cut the canti bosses off if they interfere with the calipers.

Last edited by catmandew52; 12-03-11 at 11:33 AM. Reason: added
catmandew52 is offline   Reply With Quote
Old 12-03-11, 11:39 AM   #13
AEO
Senior Member
 
AEO's Avatar
 
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Bikes: Bianchi, Miyata, Dahon, Rossin
Posts: 12,258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by catmandew52 View Post
Thats what makes the world go round.
Tektro has a realllly long reach side pull,http://www.tektro.com/_english/01_pr...e&sort=2&fid=9
But if you want to use centerpulls as pictured you may might want to look at these extra long reach Dia-compe's http://sheldonbrown.com/harris/brake-calipers.html (they'll probably flex and might be noisy) or you could make some drop bolts ala Sheldon's design if you can't find anyone who still has a few laying around'

added
You might wind up having to cut the canti bosses off if they interfere with the calipers.
to me, it looks like the cantis hit too high.

Is this a 27" to 700c conversion?
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
http://sanfrancisco.ibtimes.com/arti...ger-photos.htm
AEO is offline   Reply With Quote
Old 12-03-11, 07:05 PM   #14
Capecodder
Senior Member
Thread Starter
 
Capecodder's Avatar
 
Join Date: Jul 2010
Location: Somewhere Between The Beginning And The End
Bikes:
Posts: 1,994
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by AEO View Post
to me, it looks like the cantis hit too high.

Is this a 27" to 700c conversion?
Yes..... Any other ideas?
Capecodder is offline   Reply With Quote
Old 12-03-11, 07:19 PM   #15
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: 29,687
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 232 Post(s)
Quote:
Originally Posted by Capecodder View Post
Yes..... Any other ideas?
What's wrong with the C-pulls you were considering? Properly mounted with the half round spacers they'll do fine.

BTW- if you can't find the right spacers, take a piece of scrap, drill a hole the diameter of the bridge. Drill a 6mm hole at a right angle. Hacksaw it in half and you're good to go.
__________________
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 12-03-11, 08:37 PM   #16
Capecodder
Senior Member
Thread Starter
 
Capecodder's Avatar
 
Join Date: Jul 2010
Location: Somewhere Between The Beginning And The End
Bikes:
Posts: 1,994
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
[QUOTE=FBinNY;13560112]What's wrong with the C-pulls you were considering?[/QUOTE

Nothing, I think that they would work great, but I feel like everyone is talking me out of those. So, I wanted input on somethin I may have been overlooking. Do you think these would do the trick?
Capecodder is offline   Reply With Quote
Old 12-03-11, 09:23 PM   #17
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: 29,687
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 232 Post(s)
[QUOTE=Capecodder;13560370]
Quote:
Originally Posted by FBinNY View Post
What's wrong with the C-pulls you were considering?[/QUOTE

Nothing, I think that they would work great, but I feel like everyone is talking me out of those. So, I wanted input on somethin I may have been overlooking. Do you think these would do the trick?
Absolutely, probably far better than a Canti or V-brake with bad geometry.
__________________
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
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 05:08 PM.