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 02-19-09, 10:49 AM   #1
TallRider
Senior Member
Thread Starter
 
TallRider's Avatar
 
Join Date: Oct 2005
Location: Fresno, CA
Bikes:
Posts: 4,120
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
cable-clamp bolt and quick-release road brakes has lots of play

I'm rebuilding my Raleigh road bike to keep in California, and I've installed Nashbar "Jail Brake" dual-pivot road caliper brakes.
The brakes seem to work fine, but when tightening the bolt down on the brake cable, I notice there's a lot of play between the caliper arm and the quick-release mechanism that holds the clamping bolt.

I've taken a couple of photos to show the range of play. I disconnected the cable tension for the shot, as any tension will obviously pull the clamping bolt into the "up" position (the crisper of the two photos). I cropped the photos so that they're basically the same angle, but it's not perfect. Nevertheless, you can easily see the difference between the clamping bolt being "up" and "down".

The actual range of play is greater than what is pictured; those are just the spots that would "hold" by themselves when I pushed the bolt into position.

I'm just wondering if this points to any problem down-the-road. I doubt that it does, but it may and wanted to get people's reaction. There appears to be no way to adjust the quick-release mechanism or tighten it.

Here's Nashbar's picture of the brake itself (linked to a larger photo):


and here's my animated-gif picture of the clamping bolt's play:


Last edited by TallRider; 02-19-09 at 11:27 AM.
TallRider is offline   Reply With Quote
Old 02-19-09, 12:28 PM   #2
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Looks like it was built this way. Possibly due to the play needed to use the QR on the brake. I wouldn't worry about it (I'm a perfectionist too - you'll worry anyway). Just keep half an eye on it should it get worse. Try engaging the QR and see if it changes the play.

Nice .gif by the way!
Panthers007 is offline   Reply With Quote
Old 02-19-09, 12:37 PM   #3
TallRider
Senior Member
Thread Starter
 
TallRider's Avatar
 
Join Date: Oct 2005
Location: Fresno, CA
Bikes:
Posts: 4,120
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
glad you like the animated .gif - the difficult part was cropping two photos so they're approximately the same angle.

I don't think that there's any functional purpose of the clamp-bolt mechanism having play where it attaches to the quick-release, but neither do I think that it's likely to be a problem. Just a perfectionist, yes
TallRider is offline   Reply With Quote
Old 02-19-09, 12:43 PM   #4
MalcolmsFrejus
Senior Member
 
Join Date: Jan 2005
Location: Central Ohio
Bikes: Franklin Custom Road, Frejus TDF,Bianchi CromoLite Reparto Corse, Trek 470, Specialized Hardrock
Posts: 233
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have the same thing happening on my 600/Ultegra side pulls. No idea how long it's been like that but it's never been a problem except in my head.
MalcolmsFrejus is online now   Reply With Quote
Old 02-19-09, 01:35 PM   #5
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just checked my vintage Modolo Speedy brake-set - bought NOS out of Norway - and it has the same play when I flip it's QR lever. Checked 2 other sets of the Speedy brakes. Ditto.

See what you've done to me?!
Panthers007 is offline   Reply With Quote
Old 02-19-09, 01:45 PM   #6
TallRider
Senior Member
Thread Starter
 
TallRider's Avatar
 
Join Date: Oct 2005
Location: Fresno, CA
Bikes:
Posts: 4,120
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by Panthers007 View Post
Just checked my vintage Modolo Speedy brake-set - bought NOS out of Norway - and it has the same play when I flip it's QR lever. Checked 2 other sets of the Speedy brakes. Ditto.

See what you've done to me?!
I need you to come to Chapel Hill and check all of my bikes too
TallRider is offline   Reply With Quote
Old 02-19-09, 01:54 PM   #7
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by timcupery View Post
I need you to come to Chapel Hill and check all of my bikes too
Panthers007 is offline   Reply With Quote
Old 02-19-09, 04:31 PM   #8
AndrewP
Senior Member
 
Join Date: Sep 2001
Location: Montreal
Bikes: Peugeot Hybrid, Minelli Hybrid
Posts: 6,521
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If there were no play you wouldnt be able to operate the QR
AndrewP is offline   Reply With Quote
Old 02-19-09, 05:31 PM   #9
TallRider
Senior Member
Thread Starter
 
TallRider's Avatar
 
Join Date: Oct 2005
Location: Fresno, CA
Bikes:
Posts: 4,120
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by AndrewP View Post
If there were no play you wouldnt be able to operate the QR
this may be true, but the amount of play (i.e., lack of preload) required for the QR to be moved, is quite small.

But in this case, the play is not the in QR mechanism itself. Rathe, it's where the clamping bolt mechanism attaches to the QR mechanism. All that's required is that it be able to turn (so when the QR is flipped the clamping bolt mechanism stays in line with the cable) but it has way, way more play than necessary to ensure this.
TallRider is offline   Reply With Quote
Old 02-19-09, 05:51 PM   #10
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)
You do realize this is a $20 brake right...
operator is offline   Reply With Quote
Old 02-19-09, 06:09 PM   #11
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
On my Modolo's there is only play that's noticeable when the QR is released as I mentioned. Are yours showing this play with the QR in the loose position? One other query: Who actually makes those Nashbar brakes? Are they any good? Review please. Never heard of anyone with them - until today.

<jiggle, jiggle...>
Panthers007 is offline   Reply With Quote
Old 02-19-09, 06:58 PM   #12
TallRider
Senior Member
Thread Starter
 
TallRider's Avatar
 
Join Date: Oct 2005
Location: Fresno, CA
Bikes:
Posts: 4,120
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I think the brakes are made by Tektro. Though I'm not totally sure.
And I realize they're on the cheap side. Though not $20 cheap - they currently retail for $35, though I think I got them on sale for $25 (a common sale price at Nashbar) a couple of years ago.
The brakes work fine. Same mechanical advantage as any dual-pivot brake. Lots of people dislike the Tektro cartridge pads, and while they're not great, they're okay. I'll see how they do as I ride the bike more, though. The pads do have adjustable toe-in.

Panthers007: I described the play in more detail in my previous post:
Quote:
the play is not the in QR mechanism itself. Rather, it's where the clamping bolt mechanism attaches to the QR mechanism. All that's required is that it be able to turn (so when the QR is flipped the clamping bolt mechanism stays in line with the cable) but it has way, way more play than necessary to ensure this.
So in my case, the play is independent of the QR mechanism, probably just the result of cheap quality control but unlikely a real worry.
TallRider is offline   Reply With Quote
Old 02-19-09, 07:11 PM   #13
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks! They might be a good contender for some fixer-uppers (of a better genre than average pickin's) I've found. Do let us know if they explode. LOL.
Panthers007 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 04:04 PM.