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 03-15-08, 07:57 AM   #1
tyskstil
Junior Member
Thread Starter
 
Join Date: Aug 2006
Bikes:
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Troubleshoot on what perhaps could be an unlocked lockring?

My fixed bike has 1/5 of "freewheel" pedal rotation, meaning that i can pedal for a good 1/5 of a rotation without the rear wheel mooving. It has happened a couple of times. first time my local track bike shop fixed the problem, and now it has opened again. It has been provoked open, I believe, from trying to skid.

Did the lock ring unlock, whatever that means? Or the sprocket? How tight will I have to make these to prevent it from happening again?
tyskstil is offline   Reply With Quote
Old 03-15-08, 08:17 AM   #2
baxtefer
Cornucopia of Awesomeness
 
baxtefer's Avatar
 
Join Date: Oct 2004
Location: not where i used to be
Bikes:
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
you probably stripped your hub - by trying to skid with a loose cog and a lockring that wasn't torqued down properly.
time for a new hub...
baxtefer is offline   Reply With Quote
Old 03-15-08, 08:35 AM   #3
tyskstil
Junior Member
Thread Starter
 
Join Date: Aug 2006
Bikes:
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
But but..... It was a brand new rear wheel?
tyskstil is offline   Reply With Quote
Old 03-15-08, 08:39 AM   #4
barba
Senior Member
 
barba's Avatar
 
Join Date: Nov 2005
Bikes:
Posts: 4,083
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Remove the cog and look at the threads. If you are luck it just unthreaded a bit with no damage. More likely baxtefer is right.
barba is offline   Reply With Quote
Old 03-16-08, 02:43 AM   #5
mander
Senior Member
 
Join Date: Sep 2006
Location: Van BC
Bikes:
Posts: 3,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What happens tykstil is this: The shop installs the cog with a regular chainwhip, and they get it pretty tight. Next they install a lockring to the correct tightness. The problem is, your pedalling the bike up a big hill puts more force on the cog than a chainwhip can. So, when you get to the top of the hill, now the cog is tighter. but that makes it farther away from the lockring. So, your lockring has effectively loosened. Next time you exert backwards pressure on the pedals, say by skidding, the cog may spin away from the hub and slam into the lockring. After that, a hard acceleration will spin the cog the other way, slamming it into the hub. This back and forth violence will quickly strip threads.

Your local shop may be to blame for what happened but it's hard for me to say based only on your description.

If your hub is ****ed, that sucks but you arent the first person that this has happened to. The way to prevent its happening in the future is to get a lockring tool, mash up a hill, and tighten your lockring but good at the top. (No, you don't need a chainwhip for this). Your cog will now be as tight as it can get, and secured in place by the lockring.
mander is offline   Reply With Quote
Old 03-16-08, 12:35 PM   #6
jlin
matters cryptozoological
 
Join Date: Dec 2007
Bikes:
Posts: 149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
mander said it best. could be a loose lockring, in which case you just re-tighten it. however before you do, also take off the lockring and cog and check the hub threads to make sure they're not stripped.
jlin is offline   Reply With Quote
Old 03-19-08, 04:26 AM   #7
tyskstil
Junior Member
Thread Starter
 
Join Date: Aug 2006
Bikes:
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by mander View Post
What happens tykstil is this: The shop installs the cog with a regular chainwhip, and they get it pretty tight. Next they install a lockring to the correct tightness. The problem is, your pedalling the bike up a big hill puts more force on the cog than a chainwhip can. So, when you get to the top of the hill, now the cog is tighter. but that makes it farther away from the lockring. So, your lockring has effectively loosened. Next time you exert backwards pressure on the pedals, say by skidding, the cog may spin away from the hub and slam into the lockring. After that, a hard acceleration will spin the cog the other way, slamming it into the hub. This back and forth violence will quickly strip threads.

Your local shop may be to blame for what happened but it's hard for me to say based only on your description.

If your hub is ****ed, that sucks but you arent the first person that this has happened to. The way to prevent its happening in the future is to get a lockring tool, mash up a hill, and tighten your lockring but good at the top. (No, you don't need a chainwhip for this). Your cog will now be as tight as it can get, and secured in place by the lockring.
Wow thanks. This must be exactly what happened. Interesting that one can apply more torque with ones feet than with a chainwhip, but seems my wheel is okay, and my lockring and cog now feels super tight!

Thankyou!
tyskstil is offline   Reply With Quote
Old 03-19-08, 04:30 AM   #8
frankstoneline
stay free.
 
frankstoneline's Avatar
 
Join Date: Dec 2007
Location: Ellensburg, WA
Bikes: EAI Bare Knuckle, 1980's Ross Signature 292s 12 speed
Posts: 1,557
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
assess damages, then rotafix your cog on if the threads are still rideable and torque the lockring on. Ride it and carry a lockring spanner with you checking periodically at the top of a couple good hills and you are gold.
frankstoneline is offline   Reply With Quote
Old 03-19-08, 04:34 AM   #9
mander
Senior Member
 
Join Date: Sep 2006
Location: Van BC
Bikes:
Posts: 3,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
mander is offline   Reply With Quote
Old 03-19-08, 04:44 AM   #10
mihlbach
Senior Member
 
mihlbach's Avatar
 
Join Date: Dec 2005
Location: Long Island, NY
Bikes:
Posts: 6,419
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Never trust a shop or mechanic that does not specialize in fixed gears to install a cog and lockring because they have absolutely no idea how tight the cog and lockring really need to be.
mihlbach 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 05:42 PM.