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 12-26-07, 12:34 PM   #1
jjciiijs
Senior Member
Thread Starter
 
jjciiijs's Avatar
 
Join Date: Mar 2007
Location: CO....Hetchins MO, Merlin XL, Trek, Klien, Specialized, Kestral, Bataglin, Guerciotti, Bianchi, Schwinn, Colnago Geo, Miele, Contini, Feggin, Cannondale, Lemond, Ciocc, Giant, Rossin
Bikes: Hetchins MO, Merlin XL, Trek, Klien, Specialized, Bataglin, Guerciotti, Bianchi, Schwinn C19, Colnago Geo, Miele, Contini, Feggin,Cannondale, Lemond,Ciocc, Giant, Rossin
Posts: 386
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
jjciiijs is offline   Reply With Quote
Old 12-26-07, 12:51 PM   #2
gmcttr
Senior Member
 
Join Date: Jul 2006
Location: IN
Bikes:
Posts: 77
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
http://sheldonbrown.com/home-drop.html

This may or may not be of some help.
gmcttr is offline   Reply With Quote
Old 12-26-07, 12:56 PM   #3
jjciiijs
Senior Member
Thread Starter
 
jjciiijs's Avatar
 
Join Date: Mar 2007
Location: CO....Hetchins MO, Merlin XL, Trek, Klien, Specialized, Kestral, Bataglin, Guerciotti, Bianchi, Schwinn, Colnago Geo, Miele, Contini, Feggin, Cannondale, Lemond, Ciocc, Giant, Rossin
Bikes: Hetchins MO, Merlin XL, Trek, Klien, Specialized, Bataglin, Guerciotti, Bianchi, Schwinn C19, Colnago Geo, Miele, Contini, Feggin,Cannondale, Lemond,Ciocc, Giant, Rossin
Posts: 386
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
jjciiijs is offline   Reply With Quote
Old 12-26-07, 01:00 PM   #4
mihlbach
Senior Member
 
mihlbach's Avatar
 
Join Date: Dec 2005
Location: Long Island, NY
Bikes:
Posts: 6,400
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Turn it into a brakeless fixie?
mihlbach is offline   Reply With Quote
Old 12-26-07, 01:19 PM   #5
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,088
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
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 02:16 PM.
well biked is offline   Reply With Quote
Old 12-26-07, 03:08 PM   #6
jgedwa
surly old man
 
jgedwa's Avatar
 
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
Posts: 3,347
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
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...
--------------------------
SB forever
jgedwa is offline   Reply With Quote
Old 12-26-07, 03:41 PM   #7
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
operator is offline   Reply With Quote
Old 12-26-07, 04:09 PM   #8
jjciiijs
Senior Member
Thread Starter
 
jjciiijs's Avatar
 
Join Date: Mar 2007
Location: CO....Hetchins MO, Merlin XL, Trek, Klien, Specialized, Kestral, Bataglin, Guerciotti, Bianchi, Schwinn, Colnago Geo, Miele, Contini, Feggin, Cannondale, Lemond, Ciocc, Giant, Rossin
Bikes: Hetchins MO, Merlin XL, Trek, Klien, Specialized, Bataglin, Guerciotti, Bianchi, Schwinn C19, Colnago Geo, Miele, Contini, Feggin,Cannondale, Lemond,Ciocc, Giant, Rossin
Posts: 386
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
"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
jjciiijs is offline   Reply With Quote
Old 12-26-07, 05:07 PM   #9
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,088
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
"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?
well biked is offline   Reply With Quote
Old 12-26-07, 05:20 PM   #10
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,088
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
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-
well biked is offline   Reply With Quote
Old 12-26-07, 07:09 PM   #11
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The only thing the OP needs to do is a give us the break reach number and the problem will be solved.
operator is offline   Reply With Quote
Old 12-26-07, 08:36 PM   #12
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,088
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
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.

well biked is offline   Reply With Quote
Old 12-26-07, 08:53 PM   #13
Bikedued
Senior Member
 
Bikedued's Avatar
 
Join Date: Jul 2004
Bikes:
Posts: 10,878
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
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?
__________________
So many bikes, so little dime.
Bikedued is offline   Reply With Quote
Old 12-26-07, 08:54 PM   #14
Bikedued
Senior Member
 
Bikedued's Avatar
 
Join Date: Jul 2004
Bikes:
Posts: 10,878
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
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
__________________
So many bikes, so little dime.
Bikedued is offline   Reply With Quote
Old 12-26-07, 08:58 PM   #15
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by well biked View Post
Oh ****.

I'm going to go shoot myself now

Oh wait there's my antidepressants

:/
operator is offline   Reply With Quote
Old 12-26-07, 09:25 PM   #16
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,088
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
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-
well biked is offline   Reply With Quote
Old 12-27-07, 11:42 AM   #17
jjciiijs
Senior Member
Thread Starter
 
jjciiijs's Avatar
 
Join Date: Mar 2007
Location: CO....Hetchins MO, Merlin XL, Trek, Klien, Specialized, Kestral, Bataglin, Guerciotti, Bianchi, Schwinn, Colnago Geo, Miele, Contini, Feggin, Cannondale, Lemond, Ciocc, Giant, Rossin
Bikes: Hetchins MO, Merlin XL, Trek, Klien, Specialized, Bataglin, Guerciotti, Bianchi, Schwinn C19, Colnago Geo, Miele, Contini, Feggin,Cannondale, Lemond,Ciocc, Giant, Rossin
Posts: 386
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
jjciiijs is offline   Reply With Quote
Old 12-27-07, 11:49 AM   #18
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,088
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
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."
well biked is offline   Reply With Quote
Old 12-28-07, 09:45 AM   #19
BigBlueToe
Senior Member
 
BigBlueToe's Avatar
 
Join Date: Aug 2006
Location: Central Coast, CA
Bikes: Surly LHT, Specialized Rockhopper, Nashbar Touring (old), Specialized Stumpjumper (older), Nishiki Tourer (model unknown)
Posts: 3,393
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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?
BigBlueToe is offline   Reply With Quote
Old 12-28-07, 10:10 AM   #20
ad6mj
Senior Member
 
Join Date: Dec 2003
Location: Hemet,California
Bikes: Giant OCR2, Motobecane Fantom Trail, Specialized Hard Rock, Giant Nutra
Posts: 621
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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?
ad6mj is offline   Reply With Quote
Old 12-28-07, 10:13 AM   #21
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,088
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
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-
well biked is offline   Reply With Quote
Old 12-28-07, 12:17 PM   #22
jim10040
Senior Member
 
jim10040's Avatar
 
Join Date: Aug 2006
Location: Dallas Texas
Bikes:
Posts: 310
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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>
jim10040 is offline   Reply With Quote
Old 12-28-07, 12:26 PM   #23
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,088
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
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.
well biked is offline   Reply With Quote
Old 12-28-07, 01:46 PM   #24
iqaro
Senior Member
 
iqaro's Avatar
 
Join Date: Sep 2007
Location: Yopal (Colombia)
Bikes: Commuter: Stolen Red Kinesis frame - 26*1.9" Slicks "La Zorra" Touring: Steel frame Shimano600 gruppo 700*38 slicks
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm wondering about putting disc brakes on my 1984 touring bike... It's only an idea...
iqaro is offline   Reply With Quote
Old 12-28-07, 09:39 PM   #25
Bikedued
Senior Member
 
Bikedued's Avatar
 
Join Date: Jul 2004
Bikes:
Posts: 10,878
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
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

__________________
So many bikes, so little dime.
Bikedued 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 02:25 PM.