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 04-16-11, 12:51 PM   #1
yaganon
Senior Member
Thread Starter
 
Join Date: May 2010
Location: Iowa
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
unsymmetrical brakes

I just bought a 'packleader' hybrid for $200 (plus fenders).

I was putting it together, and I discovered the front and back brakes are screwed up. When I squeeze, only one side moves, the other side sticks to the frame. Tightening the brake onto the frame disables the brake pads from springing back after I squeeze them.

Help
yaganon is offline   Reply With Quote
Old 04-16-11, 12:58 PM   #2
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 22,205
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1142 Post(s)
Got a bike Co Op to join? they may teach you some basic mechanics..
so much better than typing words..
fietsbob is offline   Reply With Quote
Old 04-16-11, 01:35 PM   #3
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,891
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 900 Post(s)
If you have typical caliper brakes, there's a nut and lock nut on the front which controls the play on the arms. They must be adjusted so there's the minimum play while still allowing the arms to move freely, then the lock nut set to keep the adjustment.

On the back (behind the fork) there's the nut which holds the brake on. Loosen that, center the brake and tighten in that position. It should now open and close from both sides. Keep the pivot oiled with a light oil, and likewise oil where the springs meet the arms, because friction in these places can cause even a perfectly adjusted brake to open unevenly.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 04-16-11, 04:10 PM   #4
yaganon
Senior Member
Thread Starter
 
Join Date: May 2010
Location: Iowa
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Returned the bike.

I tried tightening the nut. I think I said it already. Tightening it only makes the brake pads not come back to their original positions when I squeeze the brake

not my problem now. I'm going on craigslist.
yaganon is offline   Reply With Quote
Old 04-16-11, 04:26 PM   #5
FastJake
Constant tinkerer
 
FastJake's Avatar
 
Join Date: May 2010
Location: Madison, Wisconsin
Bikes:
Posts: 7,577
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
You returned the bike because you couldn't figure out how to center the brakes? Sheesh.
FastJake is offline   Reply With Quote
Old 04-16-11, 04:31 PM   #6
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,891
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 900 Post(s)
Quote:
Originally Posted by FastJake View Post
You returned the bike because you couldn't figure out how to center the brakes? Sheesh.
No, because we couldn't explain it to him.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 04-16-11, 04:42 PM   #7
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 22,205
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1142 Post(s)
Hence the suggestion to go to a place that teaches you
how to fix your own bike, hands on.

Now the OP can take the $200 and put it towards a bike from a proper bike shop,
which has people to help you after the purchase..

I expect the
Quote:
'packleader'
left a lot to be desired , like proper assembly.
a BSO?
fietsbob is offline   Reply With Quote
Old 04-16-11, 06:20 PM   #8
yaganon
Senior Member
Thread Starter
 
Join Date: May 2010
Location: Iowa
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
There were other things wrong with the bike. for instance, part of the tire sticks out in the front wheel such when pumped to ~25 psi, you can practically see the edge of the outter tire that's suppose to be inside the metal frame. Sorry if you don't understand, I explained the best I could.

And despite the discount, it was clear that this bike wasn't going to last me very long.

So no, I didn't return the bike because of the brakes. It was a cheap bike.

And I tried following the instructions you gave me. It was a caliper brake, and there were only two nuts. One in the front and one in the back. Everything else was just washers and fittings. And like I said, tightening the nut too much makes the brakes stay in place and not bounce back when you release it. That only leaves the lack of lubrication, or just a bad spring. I had a bike that braked unevenly because the spring was more bendy on one side than the other. Getting another spring helped a little bit, but now the arms are uneven, so the pads have to be more apart so the pads' edge don't catch (this is my 80s road bike; the bike I want to buy is for my mom, she prefers hybrid or mtb. But would take a road bike if it's dirt cheap and not cheaply made).



btw. please suggest whether it's worth it to buy a 10 speed fuji bike for $135. It's from craigslist, and the guy won't send pictures. But he says that he knows it's a great bike... http://desmoines.craigslist.org/bik/2328432884.html

or maybe this one http://desmoines.craigslist.org/bik/2312130329.html

Last edited by yaganon; 04-16-11 at 06:36 PM.
yaganon is offline   Reply With Quote
Old 04-16-11, 06:42 PM   #9
FastJake
Constant tinkerer
 
FastJake's Avatar
 
Join Date: May 2010
Location: Madison, Wisconsin
Bikes:
Posts: 7,577
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by yaganon View Post
There were other things wrong with the bike. for instance, part of the tire sticks out in the front wheel such when pumped to ~25 psi, you can practically see the edge of the outter tire that's suppose to be inside the metal frame.
The tire wasn't mounted correctly.

None of the issues you describe are things that are broken or defective with the bike. They are assembly errors, and very simple ones at that. At some point, no matter what bike you buy, things will go out of adjustment or something will go wrong (flat tire for example.) At that point, you'll either need to fix it yourself or take it to a mechanic and pay to have them fix it for you. This is why knowing basic mechanics is very helpful. You'll save money, and you won't need to wait for a shop to fix your bike.

Buying an older used bike on CL is almost guaranteed to need some form of a tuneup.
FastJake is offline   Reply With Quote
Old 04-16-11, 06:43 PM   #10
xenologer
Senior Member
 
Join Date: Aug 2008
Bikes:
Posts: 2,089
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Quote:
Originally Posted by yaganon View Post


btw. please suggest whether it's worth it to buy a 10 speed fuji bike for $135. It's from craigslist, and the guy won't send pictures. But he says that he knows it's a great bike... http://desmoines.craigslist.org/bik/2328432884.html

or maybe this one http://desmoines.craigslist.org/bik/2312130329.html

Heck no. Can't see the condition w/o pics.
And how do you even know the frame sizes are right for you? neither link lists it.
Lack of info on first link, and the cut/pasted info on the second link
both scream stolen bikes.
Keep away from em.
xenologer is offline   Reply With Quote
Old 04-16-11, 07:01 PM   #11
yaganon
Senior Member
Thread Starter
 
Join Date: May 2010
Location: Iowa
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by FastJake View Post
The tire wasn't mounted correctly.

None of the issues you describe are things that are broken or defective with the bike. They are assembly errors, and very simple ones at that. At some point, no matter what bike you buy, things will go out of adjustment or something will go wrong (flat tire for example.) At that point, you'll either need to fix it yourself or take it to a mechanic and pay to have them fix it for you. This is why knowing basic mechanics is very helpful. You'll save money, and you won't need to wait for a shop to fix your bike.

Buying an older used bike on CL is almost guaranteed to need some form of a tuneup.
There was a bump, as in the inner tire was thicker at that particular section, hence why the outter tire was protruding. How is that an assembly error? Have you ever seen the outter tire protruding in a particular section because of an assembly error? If so, then please post a link or something so I can see.
yaganon is offline   Reply With Quote
Old 04-16-11, 07:28 PM   #12
tortugaflats
Senior Member
 
Join Date: May 2009
Location: el paso,tx
Bikes:
Posts: 226
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
bead did not catch in the rim. hundred of threads to correct the problem
tortugaflats is offline   Reply With Quote
Old 04-16-11, 08:52 PM   #13
2manybikes
Dog is my co-pilot
 
2manybikes's Avatar
 
Join Date: Jun 2003
Bikes: 2 many
Posts: 15,766
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 130 Post(s)
Quote:
Originally Posted by yaganon View Post
There was a bump, as in the inner tire was thicker at that particular section, hence why the outter tire was protruding. How is that an assembly error? Have you ever seen the outter tire protruding in a particular section because of an assembly error? If so, then please post a link or something so I can see.
A bit of the tube may be pinched between the tire edge and the "shelf" the tire is supposed to rest on. It's an easy fix, but the tube might be ruined. In either case when you air up the tire,the tube will probably blow in that spot. One needs to deflate the tire and lift the tire carefully to see what is in there. It's not a bike problem, it's an installation problem. Or as others say, the bead may not be seated properly. It's a person problem, not likely a bike problem. It happens often with beginners fixing a flat.
2manybikes 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 06:46 AM.