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


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-10-05, 12:33 PM   #1
skelly
anarchy burger
Thread Starter
 
skelly's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 969
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
loose/tight chain tension

Any tips on centering a chainring on the spider? I'm having some loose/tight tension and I know the ring must not be centered. I already know to tighten all the bolts evenly but I'm still having problems. Just wondering if there's any other tips any of you might offer to help me get this thing centered properly.

I wouldn't be as concerned if it was only a small difference but at it's tightest it feels like it's about to snap off, and at it's loosest it would easily fall off.. big difference.

Thanks in advance.
skelly is offline   Reply With Quote
Old 09-10-05, 12:37 PM   #2
FixedDrinks
Senior Member
 
FixedDrinks's Avatar
 
Join Date: Aug 2005
Location: Brooklyn
Bikes:
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Try this. Just did it to mine; works pretty well:
http://sheldonbrown.com/fixed.html#tension
FixedDrinks is offline   Reply With Quote
Old 09-10-05, 12:39 PM   #3
manboy
The King of Town
 
manboy's Avatar
 
Join Date: Mar 2004
Location: Richmond, VA
Bikes: Haro Backtrail 20" (MISSING), Fuji Berkeley fixie, Huffy cruisercommuterdeathmobile
Posts: 681
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've heard you want to tighten the bolts a little and then gently rotate it a few times to even the tension and center it, and then tighten all the bolts evenly. Also, as on car wheels, I think you want to tighten in a star pattern.
manboy is offline   Reply With Quote
Old 09-10-05, 12:45 PM   #4
drolldurham
ogre
 
Join Date: Oct 2004
Location: arlington, va
Bikes: surly steamroller fixie, '90 cannondale SR 800
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by skelly
Any tips on centering a chainring on the spider? I'm having some loose/tight tension and I know the ring must not be centered. I already know to tighten all the bolts evenly but I'm still having problems. Just wondering if there's any other tips any of you might offer to help me get this thing centered properly.

I wouldn't be as concerned if it was only a small difference but at it's tightest it feels like it's about to snap off, and at it's loosest it would easily fall off.. big difference.

Thanks in advance.
sheldon brown has a guide for centering a chainring on his website.... brb with the link

edit: nevermind. see above
drolldurham is offline   Reply With Quote
Old 09-10-05, 12:46 PM   #5
skelly
anarchy burger
Thread Starter
 
skelly's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 969
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah I saw that aritcle and the previous thread on this issue. I've tried all that. I always tighten each one gently going around the ring like 8 times and never 2 in a row.

I've removed and retightened this chainring like 25 times today. It looks perfectly centered on the spider. I can't figure this out. It's a BIG difference. Like when it's loose I could easily remove the chain. When it's tight I can only budge it like a few millimeters.
skelly is offline   Reply With Quote
Old 09-10-05, 12:56 PM   #6
vobopl
re:member
 
Join Date: Jan 2005
Location: Cracow, Poland
Bikes: unknown make TT bike, fixed; Romet Sport, gone; titanium Pinarello gone;Colnago with Campy C-Record/Super Record,on it's way; Funny Gianni Motta; Buehler track, Polrad track chrome; titanium MTB on 28'', fixed; Tri Wheeler, fixed
Posts: 874
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Any chance you are using eccentric BB or hub and it is rotating at the wrong place?
vobopl is offline   Reply With Quote
Old 09-10-05, 12:59 PM   #7
skelly
anarchy burger
Thread Starter
 
skelly's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 969
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
nope
skelly is offline   Reply With Quote
Old 09-10-05, 01:01 PM   #8
skelly
anarchy burger
Thread Starter
 
skelly's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 969
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
the chainring seems a little loose on the spider. the bcd is a perfect match though.
skelly is offline   Reply With Quote
Old 09-10-05, 01:26 PM   #9
the homealien
garbage picker
 
the homealien's Avatar
 
Join Date: May 2005
Location: illinwah
Bikes:
Posts: 116
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If there's a truly large difference in chain tension, you might just have a bent chainring, crank spider, and/or bottom bracket spindle. If that is the case, no amount of chainring-centering will do you any good Check to see if any of those are bent.
the homealien is offline   Reply With Quote
Old 09-10-05, 01:48 PM   #10
skelly
anarchy burger
Thread Starter
 
skelly's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 969
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yeah that was my next thought. spindle looks perfect so then i thought it might be a bent spider arm or something. but spinning with the chainring off and something right next to the spider arms for reference looks like the spider is fine too. the chainring worked 10 hours ago so i don't think it's that. boggles the mind!

if i hold my finger next to the teeth of the spinning chainring so they are just barely touching, the teeth pull away from my finger about a mm for about a 1/3 of the rotation. and by 'away' i mean toward the center of the ring not sideways.

i'm going to try another chainring just to rule that out. thanks for the suggestions.
skelly is offline   Reply With Quote
Old 09-10-05, 02:30 PM   #11
skelly
anarchy burger
Thread Starter
 
skelly's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 969
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
diff chainring works fine. i can't see anything wrong with the other one and it worked find yesterday. i don't know what happened to it...

thanks for the help guys.
skelly 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 05:27 AM.