Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-25-11, 10:13 PM   #1
ewmyers
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Sacramento, CA
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Opinions on replacement cantilevers?

I have a 1984 Univega MTB with a brake problem. I can squeeze the rear brakes for all I'm worth and still pedal the bike without too much effort. The front brakes work, but don't work great. I have have VO brake shoes with a little over 100 miles on them, so I don't think that's that problem. These Dia Compe brakes do not have an adjuster for the straddle wire, so I can't get the mechanical advantage up to where I'd like it.

I plan to replace the brakes, and am thinking I might as well put something pretty adjustable on it since this bike could become a 650b conversion down the line (it's 559 now). Does anyone have any thoughts or recommendations about the following brakes, or other suggestions?

Origin8 Origin8 Wide Profile Cantis

Origin8 Ultim8 Cantilever Brake

Tektro CR720 Cantilever Brakes

Thanks,
Eric
ewmyers is offline   Reply With Quote
Old 05-25-11, 10:19 PM   #2
illwafer
)) <> ((
 
illwafer's Avatar
 
Join Date: Mar 2008
Location: San Diego, CA
Bikes:
Posts: 2,406
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
bad idea.

first of all, the rear brake is never going to be able to stop your bike that well. front brake does most of the work. secondly, these new cantis don't jive that well with our old bikes. mtbs may be different than road bikes in this manner, i dont know.

why dont you post pictures of your brake setup so we can give you pointers?
illwafer is offline   Reply With Quote
Old 05-25-11, 10:28 PM   #3
Captain Blight
Senior Member
 
Captain Blight's Avatar
 
Join Date: Oct 2009
Location: Minneapolis
Bikes: -1973 Motobecane Mirage -197? Velosolex L'Etoile -'71 Raleigh Super Course
Posts: 2,473
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Set your brake pads very close to a very true, very clean rim and 99% of braking problems go away instantly. If you do want to swap out cantis, the Shimano BR-AT50 and BR-MC70 are widely available in used bins, look handsome, and work wonderfully.
Captain Blight is offline   Reply With Quote
Old 05-25-11, 11:16 PM   #4
khatfull
FBoD Member at Large
 
khatfull's Avatar
 
Join Date: Aug 2008
Location: Woodbury, MN
Bikes:
Posts: 6,189
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
You need to get adjuster barrels into the system somewhere.

Headset hangar for the front:



Seatpost hangar for the rear:



Both are Dia-Compe, easy to find...and you get those handy QRs too.
khatfull is offline   Reply With Quote
Old 05-26-11, 02:16 AM   #5
GrayJay
Senior Member
 
GrayJay's Avatar
 
Join Date: Sep 2009
Location: EagleRiver AK
Bikes:
Posts: 1,230
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
if these use pads with an unthreaded post, you may be able to adjust the mechanical advantage somewhat during setup by pushing the posts as far inboard as they will go, forcing the cantilever arms outward. This makes the unadjustable saddle cable angle a bit flatter and results in better mechanical advantage. you can also buy (or make) saddle wires in different lengths, a slightly shorter wire may help if you still have clearance for it.
The cyclocross forum has a good sticky note posted about cantilever setup,
http://www.bikeforums.net/showthread...lver-Brake-FAQ
GrayJay is offline   Reply With Quote
Old 05-26-11, 06:02 AM   #6
RobbieTunes 
Idiot Pro Tempo
 
RobbieTunes's Avatar
 
Join Date: Dec 2007
Location: NC
Bikes: at Pedal Room
Posts: 20,872
Mentioned: 20 Post(s)
Tagged: 1 Thread(s)
Quoted: 249 Post(s)
Get the hangars, and switch to Tektro R5 mini-V brakes. Affordable alternative and they will definitely stop you.
__________________

Robbie ♪♫♪...☻

Live your life like Coleman did.


1985 Raleigh Racing USA - Competition
1984/85/86? Klein Performance
1988 Centurion Dave Scott Ironman Master
1989 Centurion Dave Scott Ironman Expert
1989 Centurion Carbon R

http://www.pedalroom.com/members/RobbieTunes
RobbieTunes is offline   Reply With Quote
Old 05-26-11, 06:19 AM   #7
Amesja
Cottered Crank
 
Amesja's Avatar
 
Join Date: Aug 2010
Location: Chicago
Bikes: 1954 Raleigh Sports 1974 Raleigh Competition 1969 Raleigh Twenty 1964 Raleigh LTD-3
Posts: 3,496
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Maybe swap out the cantis for v-brakes? but don't forget the levers too as canti levers aren't compatible.

$30 -done.
Amesja is offline   Reply With Quote
Old 05-26-11, 08:01 AM   #8
ewmyers
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Sacramento, CA
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
These brakes are already adjusted pretty well in terms of proximity and alignment to the rim and both have barrel adjusters at the brake levers. Also the rims are clean and I replaced the brake cables. I'm not bottoming out the lever against the grip, I just can't squeeze it hard enough to make a difference. On my Gran Turismo I can adjust the length of the straddle wire and dial the brakes in quite nicely. GrayJay, I'll try your idea about the posts, I hadn't thought of that. Captain Blight, thank you for the recommendations, I'll have to look around for a shop with a decent used parts bin.
ewmyers is offline   Reply With Quote
Old 05-26-11, 08:11 AM   #9
BluesDaddy 
I got 99 projects
 
BluesDaddy's Avatar
 
Join Date: Nov 2008
Location: Hills of Central NH
Bikes:
Posts: 1,526
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Quote:
Originally Posted by ewmyers View Post
I'm not bottoming out the lever against the grip, I just can't squeeze it hard enough to make a difference.
Make sure you set the length of the brake cable such that, at full force, you can squeeze the lever almost all the way to the grip without bottoming. If you don't, you're not getting the full advantage of the work the lever is made to do. When I first started working on mountain bikes 20 years ago, I would set the brakes to engage with just maybe 3/4" of lever pull and that made the brakes feel hard and weak. Then I learned that allowing more lever travel gave the brakes more power with easier effort.
BluesDaddy is offline   Reply With Quote
Old 05-26-11, 08:17 AM   #10
Little Darwin
The Improbable Bulk
 
Little Darwin's Avatar
 
Join Date: Jul 2005
Location: Wilkes-Barre, PA
Bikes: Many
Posts: 8,402
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Are you sure that your levers are for cantilevers? A mismatch could impact the mechanical advantage, but I don't know if v brake levers with canti brakes would give you problems with mechanical advantage or with modulation...
__________________
Slow Ride Cyclists of NEPA

People do not seem to realize that their opinion of the world is also a confession of character.
- Ralph Waldo Emerson
Little Darwin is offline   Reply With Quote
Old 05-26-11, 08:26 AM   #11
nfmisso
Nigel
 
nfmisso's Avatar
 
Join Date: Mar 2011
Location: San Jose, CA
Bikes: 1980s and 1990s steel: CyclePro, Nishiki, Schwinn, SR, Trek........
Posts: 2,096
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 73 Post(s)
Quote:
Originally Posted by Amesja View Post
Maybe swap out the cantis for v-brakes? but don't forget the levers too as canti levers aren't compatible.

$30 -done.
+1
nfmisso is offline   Reply With Quote
Old 05-26-11, 08:49 AM   #12
Chris_in_Miami
Senior Member
 
Chris_in_Miami's Avatar
 
Join Date: Nov 2007
Bikes:
Posts: 4,517
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Little Darwin View Post
Are you sure that your levers are for cantilevers? A mismatch could impact the mechanical advantage, but I don't know if v brake levers with canti brakes would give you problems with mechanical advantage or with modulation...
+1

Tektro also made some levers that have an adjustable anchor point for canti and V brakes, setting the wrong point might give the results the ewmyers describes.
Chris_in_Miami is offline   Reply With Quote
Old 05-26-11, 09:03 AM   #13
unworthy1
Stop reading my posts!
 
unworthy1's Avatar
 
Join Date: Sep 2004
Bikes:
Posts: 9,442
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
might be those VO pads: I have only seen some that were sold super cheap (maybe close-outs?) from them, and even though they had the salmon color of Koolstops, they were far inferior.
unworthy1 is offline   Reply With Quote
Old 05-28-11, 05:21 PM   #14
ewmyers
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Sacramento, CA
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well, I said I had replaced the brake cables which was true, but I hadn't replaced the cable housings. I noticed there was a lot of movement in the housing when I applied the brakes, so I replaced the brake cable housing this afternoon, and now the brakes work well enough that I don't feel the need to replace them. I'll still keep an eye out for a good deal on replacements that can adjust the straddle wire, but I'm in no rush now. Thanks for your help everyone.
-Eric
ewmyers is offline   Reply With Quote
Old 05-28-11, 05:55 PM   #15
Chris_in_Miami
Senior Member
 
Chris_in_Miami's Avatar
 
Join Date: Nov 2007
Bikes:
Posts: 4,517
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Glad you got it sorted out! The housings must have been stretched out, that's pretty odd...
Chris_in_Miami is offline   Reply With Quote
Old 05-28-11, 06:07 PM   #16
frantik
Chainstay Brake Mafia
 
Join Date: Mar 2011
Location: California
Bikes:
Posts: 5,974
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
housing that is too long or not the right shape can do that.. you can lose a lot of lever distance to moving housing, especially on the rear brake. i'm actually trying to set up a rear ubrake and it seems like it might need a vbrake lever due to so much lever travel :\
frantik is offline   Reply With Quote
Old 05-28-11, 07:30 PM   #17
ewmyers
Senior Member
Thread Starter
 
Join Date: Jun 2009
Location: Sacramento, CA
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chirs_in_Miami I am not sure the old housing stretched, but it could have degraded in some way I suppose. I wonder if perhaps it wasn't original, or was actually shifter cable housing instead, since some of that seems a lot more flexible. Also, I shortened the rear brake cable housing (two pieces) by a total of almost 1 inch.
ewmyers is offline   Reply With Quote
Old 05-28-11, 08:28 PM   #18
RFC
Senior Member
 
RFC's Avatar
 
Join Date: Sep 2007
Location: Scottsdale, AZ
Bikes: many
Posts: 4,471
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
I have to think it is an adjustment issue. But, if not, I haved used these on three cyclocross bikes with excellent results. And, the price is very right.

http://www.nashbar.com/bikes/Product...1_10000_202421
RFC is offline   Reply With Quote
Old 06-09-11, 05:46 PM   #19
southpawboston 
Senior Member
 
southpawboston's Avatar
 
Join Date: Aug 2008
Location: Somerville, MA and Catskill Mtns
Bikes:
Posts: 4,011
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Quote:
Originally Posted by unworthy1 View Post
might be those VO pads: I have only seen some that were sold super cheap (maybe close-outs?) from them, and even though they had the salmon color of Koolstops, they were far inferior.
+1. Don't get me going on these worthless pieces of rim-destroying matter. They may look like Salmon Koolstops, but they don't work like them.
__________________
Velo Lumino - Lighting components and integration solutions for fine hand-built and classically inspired bicycles

Riding the Catskills blog

Flickr

1971 Mercian Olympic | 1972 Jeunet 630 | 1982 Jack Taylor Tour of Britain | 1984 Shogun 1500 650B | 2013 Rawland Stag | 2014 Jeff Lyon L'Avecaise | 2015 Bike Friday Haul-a-Day
southpawboston 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 08:19 AM.