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  1. #1
    Senior Member Capecodder's Avatar
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    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.



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    It should work fine for brakes. Roger

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    It should work fine. Just make sure you have the curved spacers for the brake mounting bolt to avoid crushing the bridge tube.

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    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.

  5. #5
    Senior Member Retro Grouch's Avatar
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    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.

  6. #6
    Senior Member Capecodder's Avatar
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    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?



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    Senior Member catmandew52's Avatar
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    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/
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    Senior Member Capecodder's Avatar
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    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.
    Amy, I'll always remember you...... I miss you so much, for you filled my days with so much joy.

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    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.

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    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.

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    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.

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    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
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  13. #13
    AEO
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    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

  14. #14
    Senior Member Capecodder's Avatar
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    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?
    Amy, I'll always remember you...... I miss you so much, for you filled my days with so much joy.

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    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
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    Senior Member Capecodder's Avatar
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    [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?
    Amy, I'll always remember you...... I miss you so much, for you filled my days with so much joy.

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    [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.
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