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 04-23-09, 01:54 PM   #1
kit
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: Peppi's
Bikes:
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Grind off chainring pins for fixed gear?

I found a 52t chainring at the LBS that I'd like to put on my fixed gear. The ring has shifting pins on it, and my chainline already isn't perfect. Is there any reason I couldn't just grind or file the pins off?
kit is offline   Reply With Quote
Old 04-23-09, 02:12 PM   #2
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
Posts: 3,769
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chainring pins are only useful if you have a bike with a front derailleur.

However, your description leads me to think that your chainline is bad, your drivetrain is noisy or not smooth, and you think grinding the pins off will help smooth it out... in fact, the pins are likely having no effect on the drivetrain, and the only fix for your problems is to get the chainline correct.

Good luck!
LarDasse74 is offline   Reply With Quote
Old 04-23-09, 02:21 PM   #3
AEO
Senior Member
 
AEO's Avatar
 
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Bikes: Bianchi, Miyata, Dahon, Rossin
Posts: 12,258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
no need, the pins don't add any sort of noise.
but the shaped teeth don't help the longevity.
if you haven't bought it already, why don't you go look around for some older (5~7sp era) chainrings with no pins or ramps?
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
http://sanfrancisco.ibtimes.com/arti...ger-photos.htm
AEO is offline   Reply With Quote
Old 04-23-09, 02:43 PM   #4
kit
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: Peppi's
Bikes:
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I can't seem to find any 135 BCD chainrings without pins. (Except for 1/8" ones, which I'm trying to avoid.) Do I just need to be more patient? Do they come up on ebay?

LarDasse: I bought a complete bike with a chainline that looks to be off by about 7.5 mm. It's actually completely quiet-- just not at the gear ratio that I would like.
kit is offline   Reply With Quote
Old 04-23-09, 02:49 PM   #5
kit
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: Peppi's
Bikes:
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
And to further clarify, I'm concerned about the pins encouraging the chain to jump off, not the noise.
kit is offline   Reply With Quote
Old 04-23-09, 02:58 PM   #6
DaveSSS
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
Posts: 4,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The pins only aid the shift up from the little ring. They have no effect on the function of the chain once it's on the big ring.
DaveSSS is offline   Reply With Quote
Old 04-23-09, 06:55 PM   #7
tellyho
Your mom
 
Join Date: Aug 2006
Bikes:
Posts: 2,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
7.5 mm
Seriously? That's WAY too much of a difference. A silent drivetrain will not be much comfort when you suck the chain and faceplant. And I'm a pretty relaxed guy on the chainline front. You need to fix that.

As far as the pin is concerned, there's no way it will affect anything, as your chain will never get anywhere near it.
tellyho is offline   Reply With Quote
Old 04-23-09, 08:42 PM   #8
kit
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: Peppi's
Bikes:
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for all of the help. I guess I won't get to go to the Darwin Award ceremony after all.
kit 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 01:58 AM.