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  1. #1
    Senior Member jjciiijs's Avatar
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    700c wheel conversion on 27" wheel bike

    A Schwinn I have originally came with 27" wheels and I only have 700c to put on it. I bought 2 'dropdown' bolts for the campy side pull brakes I have and find that the brakes are still not low enough. I seem to need another 1/8-3/16" reach??? I thought that drop down bolts were the fix for this problem??? That is why they made them in the first place.

    You have any knowledge on this issue?

    Oh, if you are going to tell me to measure my Campy brakes, I will need to know from where to where.
    What knid are they? Campy side pulls from the 60s I guess.
    Jeff
    Square wheels need not apply

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    http://sheldonbrown.com/home-drop.html

    This may or may not be of some help.

  3. #3
    Senior Member jjciiijs's Avatar
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    Quote Originally Posted by gmcttr View Post
    http://sheldonbrown.com/home-drop.html
    This may or may not be of some help.
    I would sure hate to do that to a vintage Schwinn. Hope there is another idea / solution out there.
    Jeff
    Square wheels need not apply

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    Senior Member mihlbach's Avatar
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    Turn it into a brakeless fixie?

  5. #5
    biked well well biked's Avatar
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    To determine the necessary brake reach, you measure from the center of the brake mount hole (on the seatstay bridge for the rear, fork crown for the front) to the center of the brake surface on the rim. The difference in necessary reach between 27" rims (630mm bead seat diameter) and 700c rims (622mm bead seat diameter) is that you need 4mm more reach for 700c. I'd go a different route than drop bolts if at all possible, if it were mine. What model Schwinn is it?
    Last edited by well biked; 12-26-07 at 01:16 PM.

  6. #6
    surly old man jgedwa's Avatar
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    To measure the advertised reach of a brake, measure from the bolt hole to the center of the slot that the pads go through. Depending on the length of this slot, brakes of a given reach can give you some wiggle room up and down from that center point.

    jim
    Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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  7. #7
    cab horn
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    Quote Originally Posted by jjciiijs View Post
    A Schwinn I have originally came with 27" wheels and I only have 700c to put on it. I bought 2 'dropdown' bolts for the campy side pull brakes I have and find that the brakes are still not low enough. I seem to need another 1/8-3/16" reach??? I thought that drop down bolts were the fix for this problem??? That is why they made them in the first place.

    You have any knowledge on this issue?

    Oh, if you are going to tell me to measure my Campy brakes, I will need to know from where to where.
    What knid are they? Campy side pulls from the 60s I guess.
    You can get tektro dual pivots with huge reach. Enough reach to do 99% of the 27" to 700c conversions. Sheldon brown has a selection on his site.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  8. #8
    Senior Member jjciiijs's Avatar
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    "To determine the necessary brake reach, you measure from the center of the brake mount hole (on the seatstay bridge for the rear, fork crown for the front) to the center of the brake surface on the rim. The difference in necessary reach between 27" rims (630mm bead seat diameter) and 700c rims (622mm bead seat diameter) is that you need 4mm more reach for 700c. I'd go a different route than drop bolts if at all possible, if it were mine. What model Schwinn is it? "



    it is a Model C-19
    Jeff
    Square wheels need not apply

  9. #9
    biked well well biked's Avatar
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    "it is a Model C-19"


    Do you by any chance have a link or a pic? I'm familiar with a lot of Schwinns, but not a Schwinn model C-19. Going by your brake question, I presume it's a road bike? Do you know how old it is?

  10. #10
    biked well well biked's Avatar
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    I just saw your thread in C and V, since you say the bike originally had centerpulls I would strongly recommend sticking with those for the benefit of the long reach they provide. If the ones you have are no good, they're readily available on ebay for cheap. Some models have more reach than others, just make sure you get the correct brakes for your needs. I'm still curious about your Schwinn C-19, please provide more info on it-

  11. #11
    cab horn
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    The only thing the OP needs to do is a give us the break reach number and the problem will be solved.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  12. #12
    biked well well biked's Avatar
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    Quote Originally Posted by operator View Post
    The only thing the OP needs to do is a give us the break reach number and the problem will be solved.


  13. #13
    Senior Member Bikedued's Avatar
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    I had a Schwinn Le tour frame that fit 27's fine, yet throw a 700 wheel on it, and the brakes ran out of reach. These were Sante brakes on an 87 Le Tour. Never heard of a Schwin C19?? Is it older like 70's centerpull style, or older like mid to late eighties when the quality jumped up?,,,,BD


    lol, just looked it up. C-19 is a wheelset from what I found?
    "Whale. Oil. Beef. Hooked!" The Rumjacks

  14. #14
    Senior Member Bikedued's Avatar
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    Oh so it is centerpulls? missed that before. Tear the brakes down, polish and lube, and buy Koolstop pads. Problem solved. My 74 SS stops so well it still surprises me.,,,,BD
    "Whale. Oil. Beef. Hooked!" The Rumjacks

  15. #15
    cab horn
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    Quote Originally Posted by well biked View Post
    Oh ****.

    I'm going to go shoot myself now

    Oh wait there's my antidepressants

    :/
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  16. #16
    biked well well biked's Avatar
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    Quote Originally Posted by Bikedued View Post
    Oh so it is centerpulls? missed that before. Tear the brakes down, polish and lube, and buy Koolstop pads. Problem solved.
    That's what I'm thinking, too. It's hard to beat centerpulls for long reach. I've got two bikes that I've converted from 27's to 700c's, the centerpull brakes reach the 700c rims no problem. And if the original centerpulls don't reach, it's not hard to find some with longer reach-

  17. #17
    Senior Member jjciiijs's Avatar
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    As for more info on the bike, it is a chrome frame I believe built in the 60's. I was told the model was 19, and 'C' for chrome.

    I hear all the info that center pulls are the way to go. originally, I just had new 'older' Campy stuff and thiought it was nicer looking. Guess I will have to give that thought up and go back to the center pulls and the drilled Campy levers.

    Perhaps I can find some NICE looking center pulls. The Weinmann I have don't impress me.
    Jeff
    Square wheels need not apply

  18. #18
    biked well well biked's Avatar
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    Maybe it's a 19" chrome frame?..........Here's a link to BF member Bob Hufford's excellent site. http://www.geocities.com/sldatabook/publications.html

    Catalogs of "lightweight" Schwinns from '60 to '79, you might browse through and see if you can find your bike. Also, if you can post a pic in C and V, you can get it ID'd.

    You're not alone in not liking the look of the Weinmann centerpulls, but FWIW, with Kool Stop pads installed they're functionally good brakes. I'm in the minority in that I even like the look of them. Some people say "clunky," I say "robust."

  19. #19
    Senior Member BigBlueToe's Avatar
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    I have a touring frame with 27" wheels and cantilever brakes. I want to switch to 700 wheels. Do the cantilevers make the switch any easier?

  20. #20
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    Quote Originally Posted by BigBlueToe View Post
    I have a touring frame with 27" wheels and cantilever brakes. I want to switch to 700 wheels. Do the cantilevers make the switch any easier?
    Look at the brakes. Is there adjustment range where the pads could be lowered?

  21. #21
    biked well well biked's Avatar
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    Quote Originally Posted by BigBlueToe View Post
    I have a touring frame with 27" wheels and cantilever brakes. I want to switch to 700 wheels. Do the cantilevers make the switch any easier?
    I've got one, too, equipped with Dia Compe canti's. Little or no vertical adjustability on those brakes. But what's really bad is that the distance between the brake bosses is quite a bit less than later canti's, so more modern cant's with vertical adjustability won't fit. Maybe someone else has an idea, but that's the way it is on my '80's touring bike with 27's and canti's. Eventually I'm going to cut the canti bosses off and use centerpulls and 700c's, but for now I'm sticking with 27's and the old canti's on that bike-

  22. #22
    Senior Member jim10040's Avatar
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    My experience with 27" wheels with cantilever brakes is that 700 rims have a smaller diameter, so if you don't have much adjustment for the pads as it is, you will likely have problems with the smaller rims.

    As for cutting and welding etc, I bought my Univega Gran Turismo for $55, including Look pedals. I ain't cuttin' nuthin. <\C&V rant>

  23. #23
    biked well well biked's Avatar
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    Quote Originally Posted by jim10040 View Post
    As for cutting and welding etc, I bought my Univega Gran Turismo for $55, including Look pedals. I ain't cuttin' nuthin. <\C&V rant>
    Your bike, your choice. My bike, my choice. I really the bike, too; but the brakes suck. FWIW, I've been riding "vintage" bikes since they were new. In my opinion, some are worth fretting over in terms of originality, some aren't. This one isn't.

  24. #24
    Senior Member iqaro's Avatar
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    I'm wondering about putting disc brakes on my 1984 touring bike... It's only an idea...
    Bike commuting spare me what I do not like, and allow me what I do like....

  25. #25
    Senior Member Bikedued's Avatar
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    Eighties Shogun with Shimano canti's. When I bought the bike it had a 27" in front and a 700 in the back. It now sports 700's front and rear, and fresh paint. The brakes adjusted with no problems. There's only 4mm difference from what I hear? Most canti's should be able to handle that easily.,,,,BD

    "Whale. Oil. Beef. Hooked!" The Rumjacks

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