What would you do with this rear brake?
...besides putting brake blocks in the caliper... :-)
This is on an '84 Schwinn, low-step frame. https://farm5.staticflickr.com/4771/...26d2d1e7_h.jpg The original brake caliper was a Dia-Compe single pivot with reversed cable stop/anchor, typical of brakes used with these types of frames, where the brake cable comes up from the bottom in a large radius curve (also pictured below). I didn't care for that approach too much, as it seemed to restrict me to older single pivot brake calipers. I got these center-pull calipers for free from my LBS from a bike they were disassembling, and I've ran the rear brake cable through both: (1) the noodle-and-hanger you see in the picture above, and (2) through a small pulley attached to the seat clamp bolt with a bolt-on cable stop on the seat tube. Neither one of these solutions seems to be ideal, either. The primary problem I'm having now is the yoke is not centered on the straddle cable, so I get uneven pull from each brake arm. The yoke appears centered in the picture above, but after a number of pulls on the lever, it eventually works its way over to the right side, pulled by the off-centered cable hanger. Neither solution seems all that elegant to me. I know these low-step frames can be troublesome in setting up a rear brake. Is the stock setup, shown below, about the most elegant way possible for a frame like this? I appreciate any thoughts, comments, or ideas. https://farm5.staticflickr.com/4577/...530d3838_h.jpg |
Are you set on having that center pull style brake? I think unless you can get the hanger between the lug ears you’ll always be off to the side.
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Originally Posted by Bianchigirll
(Post 20207552)
Are you set on having that center pull style brake? I think unless you can get the hanger between the lug ears you’ll always be off to the side.
Maybe that's the lesser of the two evils on a frame type such as this? Are there any clever ways of using a modern dual pivot brake? I guess the cable would have to snake up the seat tube (like it is now) and then loop back down towards the caliper. Is there a good way to keep that cable secured/mounted? Or would such an S-curve not work well in the first place? |
There are cable hanger that will center the cable.
Universal CP Hanger: [IMG]https://farm6.staticflickr.com/5550/...674dd08a_z.jpg075_PaTrek, on Flickr[/IMG] Front brakes typically have shorter calipers. Your rear one looks like one as well so you might not have an option other than to swap to 700 rims, if that will be enough. Upon further examination, there may be CP's with less distance between the mounting bolt and pivot mounts. Here is a front Universal that my be shorter than yours: [IMG]https://farm8.staticflickr.com/7310/...d13d5d81_z.jpg085_PaTrek_front brake and tire saver, on Flickr[/IMG] |
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Originally Posted by Bianchigirll
(Post 20207552)
Are you set on having that center pull style brake? I think unless you can get the hanger between the lug ears you’ll always be off to the side.
http://www.os2.dhs.org/~john/DC-hanger.jpg |
Originally Posted by SJX426
(Post 20207638)
Front brakes typically have shorter calipers. Your rear one looks like one as well so you might not have an option other than to swap to 700 rims, if that will be enough.
Originally Posted by JohnDThompson
(Post 20207701)
That style of hanger is actually intended to be mounted between the lug ears.
Thanks for the reminder on this -- it may be my best solution with the existing hardware. |
I think the pulley and cable stop method may be the best solution if you can center the pulley between the ears of the seat lug and mount the cable stop on the back of the seat tube:
http://1.bp.blogspot.com/_hf6_g-DH_P...0/IMG_0998.JPG Photo from an image search. Otherwise, ditch the noodle and try a loop in the cable housing: http://www.classiclightweights.co.uk...ns-frames4.jpg Another copied image. Brent |
Originally Posted by obrentharris
(Post 20207845)
I think the pulley and cable stop method may be the best solution if you can center the pulley between the ears of the seat lug and mount the cable stop on the back of the seat tube:
http://1.bp.blogspot.com/_hf6_g-DH_P...0/IMG_0998.JPG Photo from an image search.
Originally Posted by obrentharris
(Post 20207845)
Otherwise, ditch the noodle and try a loop in the cable housing:
http://www.classiclightweights.co.uk...ns-frames4.jpg Another copied image. Brent |
Thanks for the ideas, everyone. I thought the noodle would reduce flex/compression in the system and figured that any loop of cable that I could eliminate, or at least replace with a non-compressible piece, would be worth doing. It obviously didn't work as well as I wanted it to. I will also concede that the pulley I used was pretty small in diameter, and the cable just sort of "bent" around it rather than wrapped around it smoothly, if that makes any sense.
I definitely have some things to try. |
The really easy fix is to replace the OEM yoke with any of the yokes that have set screws for the bridle cable. I use the popular black ones on several bikes. You may well find you have to set it off center to get the brake pads centered but everything stays put and requires no attention.
Harris Cyclery Tektro Deluxe Yoke Silver BRH05 $6.95 (There are several other similar yokes. I've never used these but they should do just fine.) Ben |
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Here's another shot of probably your best option, which is the stock Schwinn pulley; it ain't pretty but it works like a champ. This one's on a Mesa Runner, brakes are cantilever. I'd wager you can find one at your local co-op for a buck or two.
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It may be hard to see in this picture, but my daughter's Bianchi Advantage is set up with one of those pulleys. Works great for her cantilever brakes and I don't see why it wouldn't work just as well for centerpulls.
https://www.bikeforums.net/attachmen...hmentid=597702 |
I did reposition the hanger to between the seat post clamp lugs (centered), and that definitely centers the yoke, but the cable's route to get there isn't ideal. I agree that a larger diameter pulley may be best. I like the option of having the cable stop built in to the pulley. I live in the country, and the nearest bike co-op is over an hour and a half away. Next time I go to the big city, I'll check it out.
Does anyone happen to have one of these Schwinn/similar pulleys unused you'd be willing to sell? If so, please PM me. Thanks, all. |
Originally Posted by hokiefyd
(Post 20209338)
I live in the country, and the nearest bike co-op is over an hour and a half away.
Originally Posted by hokiefyd
(Post 20209338)
Does anyone happen to have one of these Schwinn/similar pulleys unused you'd be willing to sell?
https://www.ebay.com/itm/381293125287 |
Through the generosity of a forum member (@3speedslow), I have a rear cable pulley on the bike.
https://farm5.staticflickr.com/4782/...04c33807_h.jpg The cable is centered over the yoke and I was able to keep using the stock Dia-Compe yoke (that I prefer over the "closed" triangular yokes, as this is essentially my quick release on the brake). As installed, the pulley doesn't turn -- the cable just slides over it. I think the unit got compressed just slightly when installed on the seat post clamp. The pulley will turn, but with some finger force. I think it's okay for now, and I may just use some dry lube there where the cable slides. |
Glad I could help. A washer placed under the bolt could open up the pulley bracket.
I like the yellow cables which match the decals and fork and go well with the blue. |
Originally Posted by 3speedslow
(Post 20221426)
Glad I could help. A washer placed under the bolt could open up the pulley bracket.
I like the yellow cables which match the decals and fork and go well with the blue. Thank you for the compliment on the color coordination. I think the bike looks pretty nice. I bought it to try a road bar and road levers, but I just couldn't get into it, so I've got a hodge-podge of mountain/hybrid bike parts on it at the moment. The step-through frame is interesting, though it definitely makes the bike feel a little twitchy at speed. The combination of the "soft" chromoly tubing, the parallelogram of a main "triangle", the already steep(ish) head tube angle ('80s road bike), and the replacement Fuji fork that appears to have more offset than the OEM fork (which should reduce trail) makes for a "whippy" feeling bike when steering at speed. Most of my bikes feel very stable at speed, but this one feels like the front of the frame is only casually connected to the rear. It's a different feeling, but I think this flexibility in the frame/system is also what makes it super comfortable to ride. Despite the relatively narrow tires (compared to what I have on my other bikes) and higher inflation pressure, this bike is one of my softest-riding. It's been fun to play with and ride around the neighborhood. |
rear cable pulley
Hi,
I am looking for a rear cable pulley, for a very similar bike as the one shown in the forum... do you know where I could find one? Thanks!
Originally Posted by 3speedslow
(Post 20221426)
Glad I could help. A washer placed under the bolt could open up the pulley bracket.
I like the yellow cables which match the decals and fork and go well with the blue. |
You just need a design with a braze-on in the proper location for a cleaner brake run of much shorter cable length for a tighter system.
here’s one pic. let me check for a closer-up. https://cimg0.ibsrv.net/gimg/bikefor...802670fbd.jpeg |
Originally Posted by Sportivo
(Post 22046843)
Hi,
I am looking for a rear cable pulley, for a very similar bike as the one shown in the forum... do you know where I could find one? Thanks! Sorry, not at the moment. They are out there, maybe at a close to you bike shop or co-op. happy hunting! |
@Sportivo. Welcome! If you don’t find what you need at your local bike shop or co-op, there are several options currently available on eBay. Try searching with terms: cable hanger pulley.
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I know that it has NO effect on function but aesthetically, I would turn the “Dia-Compe” yoke around :rolleyes:. Just looks better that way :thumb:. If you think that the cable routing compromises brake “pull” in any way, I’d definitely keep the centerpulls opposed sidepulls. IMHO, they provide better stopping power. Of course, that’s my opinion :thumb:
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